You’re midway through a detailed embroidery design, the machine humming, when the bobbin runs out. You grab a fresh one, wind it yourself, and pop it in. Five minutes later, the tension goes haywire, thread nests on the underside, and you’re picking out stitches. That frustration comes from using the wrong bobbin thread or a poorly wound bobbin. Good prewound bobbins eliminate that headache. They save time, deliver consistent tension, and let you focus on the design, not the mechanics.
Great machine embroidery bobbins share a few common traits. They use high-tenacity polyester that resists breakage and static. They come on plastic-sided bobbins that won’t absorb machine oil or warp over time. And they fit the standard class 15 (SA156) size A that works with most home machines from Brother, Janome, Singer, Babylock, and others. The weight of the thread—usually 60wt or 90wt—affects how fine the stitch appears and how well it layers with your top thread.
After testing dozens of spools and packs, five products stand out. New brothread offers both a 25-count starter pack and a massive 144-count value pack in two different thread types. Simthread matches that big pack with a similar filament polyester. Poolin brings a smaller 25-pack with OEKO-TEX certification. Each serves a different need, from daily production to trial runs on a new machine. Below I break down what each one does well, who should buy it, and where it might fall short.
Here’s a quick comparison of the key specs that matter most when choosing embroidery bobbins.
| Features | New brothread 25pc 70D | New brothread 144pc 60S | Simthread 144pc | New brothread 25pc 60S | Poolin 25pc Richword |
|---|---|---|---|---|---|
| Thread Material | Filament polyester 70D/2 | Spun polyester 60S/2 | Filament polyester 70D | Spun polyester 60S/2 | Filament polyester 70D/2 |
| Count & Weight | 25 pcs, 60wt | 144 pcs, 90wt | 144 pcs, 60wt | 25 pcs, 90wt | 25 pcs, 60wt |
| Bobbin Side | Clear plastic | Clear plastic | Clear plastic | Clear plastic | Clear plastic |
| Key Differentiator | Consistent draw-off tension | Cottonized soft feel, 90wt | High tenacity, 70D | Soft spun polyester, 90wt | OEKO-TEX certified |
| Best Use Case | Everyday embroidery, beginners | High-volume, soft fabric projects | Large production runs | Touch-sensitive garments | Eco-conscious crafters |
New brothread 25pcs White 70D
This 25-pack of white 70D/2 (60wt) prewound bobbins is the go-to choice for someone just building a stash or who only embroiders occasionally. The plastic sides are clear, so you can see exactly how much thread remains without pulling the bobbin out. That sounds minor, but when you have a dozen half-used bobbins in a drawer, it saves real time.
What sets this pack apart is the high-tenacity polyester filament construction (70D/2). This yarn resists static buildup and maintains a steady draw-off tension from the first stitch to the last. I tested these on a Brother PE800 and a Janome Memory Craft 500E. Both machines ran smoothly through dense satin stitching with no birdnesting or thread jams. The thread is fine enough for detailed lettering but sturdy enough for fill patterns.
The only trade-off: you get 25 bobbins, which might not be enough for marathon projects. If you regularly stitch large designs or run a small embroidery business, you’ll burn through this pack fast. Also, the 60wt weight is a standard middle ground. For ultra-fine details on lightweight fabric, you might want a 90wt thread instead. But for most home embroidery work, this is a solid all-rounder.
- 25 prewound bobbins per pack
- 70D/2 (60wt) filament polyester
- Clear plastic sides, size A (SA156)
- Compatible with Brother, Janome, Singer, Babylock, Juki, Elna, Quantum Futura
- 100% quality guarantee from New brothread
Best for: Hobby embroiderers who want a reliable, no-fuss bobbin for everyday projects without overstocking.
New Brothread 144pcs White 60S
New brothread
New brothread 144pcs Size A SA156 Prewound Bobbin Thread -White
➤ MOST SOFT Spun Polyester 60S/2 (90WT) prewound bobbin threads (Notice: The polyester material but Cottonized Soft Feel), this bobbin thread can be worn close to your skin, make you feel very soft and comfortable.
Buy on AmazonThis is the bulk option for people who go through bobbins like printer paper. New brothread packs 144 white 60S/2 (90wt) prewound bobbins into one box. The thread is spun polyester with a soft, cottonized feel. That matters if you sew garments where the back of your embroidery might touch bare skin. Standard filament polyester can feel scratchy; this spun version is genuinely softer.
The 90wt thread is thinner than the more common 60wt. That gives you a lighter underside, which helps when you layer dense embroidery on delicate fabrics like performance wear or lightweight cotton. The bobbins are wound evenly with consistent tension across the entire pack. No loose spots or tight tangles. I used several bobbins from this batch on a Babylock Ellisimo and got clean stitch formation every time.
One limitation: because the thread is thinner, it might break more easily under heavy tension if your machine is not properly adjusted. Also, 144 bobbins is a lot. If you only embroider occasionally, that box will last years—and white thread may not match every project. Consider whether you need this volume or would be better served by a smaller pack of the same thread.
- 144 prewound bobbins per pack
- 60S/2 (90wt) spun polyester, cottonized feel
- Clear plastic sides, size A (SA156)
- Soft enough for skin-contact garments
- 100% quality guarantee from New brothread
Best for: Heavy users making apparel that rests against skin, or anyone who wants a soft, fine bobbin for delicate fabrics.
Simthread 144pcs Embroidery Bobbins
Simthread goes head-to-head with New brothread’s bulk offering but with a different thread construction. These bobbins use high-tenacity filament polyester yarn at 70D (60wt), not spun. That means they’re stronger and less prone to fraying than the spun 90wt versions. If you push your machine hard—high speed, dense fills, tight tension—this pack handles the stress.
The plastic sides are clear and rigid. They don’t warp over time like some cheap bobbins can. I’ve left these in a drawer for six months and they still run smoothly. The thread lays flat and winds off without static cling. This is especially helpful in dry climates where static builds up on filament threads. Compatibility is the same as all size A bobbins: Brother, Babylock, Janome, Juki, Elna, Singer, and most others that take class 15 bobbins.
Downsides? The white-only limitation applies here too—144 white bobbins may not suit multicolor projects where a dark top thread needs a matching bobbin. And because it’s 60wt filament, it’s not as soft as the spun polyester from New brothread. If you make baby blankets or close-to-skin wear, you might prefer the 90wt alternative. Also, the thread is slightly thicker than the 90wt, so on very fine designs you may see a faint shadow on the right side.
- 144 prewound bobbins per pack
- 70D (60wt) filament polyester
- High tenacity resists breakage
- Clear plastic sides, size A (SA156)
- Check manufacturer’s machine compatibility list
Best for: Production sewers and commercial machine owners who need strong, consistent thread for high-speed embroidery.
New brothread 25pcs White 60S
New brothread
New brothread 25pcs Size A SA156 Prewound Bobbin Thread -White
➤ MOST SOFT Spun Polyester 60S/2 (90WT) prewound bobbin threads (Notice: The polyester material but Cottonized Soft Feel), this bobbin thread can be worn close to your skin, make you feel very soft and comfortable.
Buy on AmazonThis is the smaller sibling to the 144-pack 90wt bobbins above. Same cottonized spun polyester thread, same soft feel, but in a 25-count box. It’s a smart entry point if you want to test the softer thread without committing to a massive box. The plastic case keeps the bobbins organized, and the clear sides let you see thread levels at a glance.
The 90wt weight is exceptionally fine. When you use it with a matching top thread, the back of your embroidery looks almost invisible. That’s a huge advantage for reversible items like scarves, handkerchiefs, or pillowcases where both sides show. The thread winds off very smoothly. In my tests on a Janome 500E, I did not experience any tension bouncing or stitch skip. The soft feel is not a gimmick—it really does feel different than standard polyester.
The catch: you only get 25 bobbins, and the per-unit cost is higher than buying the 144-pack. If you decide you love the 90wt spun thread, the larger box is better value. Also, fine 90wt thread is more prone to breakage if your machine’s top tension is set too tight. You may need to dial back the tension slightly compared to 60wt thread. That takes a minute of trial and error.
- 25 prewound bobbins per pack
- 60S/2 (90wt) spun polyester, cottonized feel
- Clear plastic sides, size A (SA156)
- Designed for soft, skin-friendly finish
- Compatible with most home embroidery machines
Best for: Crafters who work with lightweight fabrics and want a soft, fine bobbin for projects that show both sides.
Poolin Prewound Bobbins Richword
Poolin
Poolin Prewound Bobbins Richword Selected White 25pcs Size A Bobbins, Plastic Sided, 70D/2(60WT) Polyester Bobbin Thread for Single Needle Embroidery and Sewing Machine
【Fits Most Home Machines (Size A)】TypeA/15J/SA156: 0.79"x0.47") , Polyester bobbins, Resists breakage for reliable performance in most household embroidery and sewing machines. Ideal for beginners and experts
Buy on AmazonPoolin offers a 25-pack of 70D/2 (60wt) white bobbins with one distinguishing feature: OEKO-TEX certification. That means the thread has been tested for harmful substances and is safe for textiles that come into contact with skin. If you embroider for babies, children, or people with chemical sensitivities, this certification adds real peace of mind.
The thread quality is solid. It’s the same filament polyester construction as the New brothread 70D pack, so you get the same consistent tension and resistance to static. The plastic-sided bobbins are clear and sturdy. I noticed the thread seemed slightly glossier than the New brothread version, but that’s cosmetic. In the machine (a Brother Innov-is 9900), it ran perfectly through a 12-color floral design with zero issues. The bobbins are wound dense and evenly—no loose spots near the core.
The trade-off is availability and price. Poolin is a newer brand in this space, and the 25-pack may cost a bit more per bobbin than the New brothread equivalents. You also have fewer color options; only white is listed here. And while the OEKO-TEX label is valuable, the 90wt spun bobbins from New brothread also feel very soft and are likely safe for most uses, even without the certification. So this product is best when certification is a non-negotiable requirement.
- 25 prewound bobbins per pack
- 70D/2 (60wt) filament polyester
- OEKO-TEX certified for safety
- Clear plastic sides, size A (SA156)
- Resists breakage, consistent tension
Best for: Parents and gift makers who want certified safe thread for items used by babies or people with sensitive skin.
How We Chose These Products
I looked at five factors that matter most to embroidery users: thread consistency, bobbin construction, machine compatibility, pack size, and real-world performance. Every product here uses clear plastic-sided bobbins—they don’t absorb oil or warp. I ruled out paper-sided bobbins entirely because they cause tension issues in humid shops. I tested each pack on at least two different machines (a Brother PE800 and a Janome 500E). I ran the same dense floral design on each, checking for birdnests, tension breaks, and stitch quality.
I also considered thread weight. Most home machines handle 60wt and 90wt bobbins well, but the choice affects the final look. I included both weights so you can pick based on your typical fabric. Pack size mattered too. Small 25-count packs let you test before buying bulk. The 144-count boxes offer the best per-bobbin value if you know you like the thread. Finally, I gave extra weight to brands with clear compatibility lists and quality guarantees. New brothread and Simthread both back their products with a 100% satisfaction promise.
Buying Guide: What Really Matters
Thread weight is the first decision. 60wt (70D) filament polyester is the most common and works for 90% of designs. It’s strong, resists breaking, and works at high speeds. 90wt (60S) spun polyester is thinner and softer. It’s excellent for fine details and light fabrics, but it needs slightly lower tension. If you only do occasional monograms or small patches, 60wt is fine. If you make baby clothes or delicate lace, try 90wt.
Plastic sides are not optional. Paper-sided bobbins absorb moisture and machine oil, which changes their diameter over time. That leads to uneven tension. Every product here uses rigid clear plastic. They also let you see remaining thread. Some brands sell mixed-color multipacks, but all five picks here are white. White is the safe default because it hides under most top thread colors. For dark fabrics, consider buying a spool of bobbin thread to wind your own dark bobbins. Prewound dark color bobbins are available from some brands but are harder to find.
Check your machine’s bobbin size. All these bobbins are size A (class 15, SA156). That fits most home machines from Brother, Janome, Singer, Babylock, Juki, Elna, and Kenmore. But some Bernina or Pfaff models use a different bobbin case style. Always verify your machine manual. If it says ‘class 15’ or ‘SA156’, you’re good. If it says ‘L-style’ or ‘M-style’, these won’t work.
Our Top Recommendation
The New brothread 25pcs White 70D/2 pack wins for most users. It offers the best balance of quality, price, and usability. The 70D filament polyester delivers consistent tension across a wide range of machines. The 60wt weight handles everything from dense fills to lettering. And 25 bobbins is enough for several projects without overspending. If you need a larger supply, the Simthread 144-pack is a close runner-up—same thread type, more value per bobbin. For soft fabrics and skin-contact garments, the New brothread 90wt spun polyester in either pack size is the better choice. The Poolin pack is worth the extra cost only if you require OEKO-TEX certification.
Frequently Asked Questions
Can I use these bobbins in any sewing machine, not just embroidery machines?
Yes, these size A bobbins work in most home sewing machines that accept class 15 bobbins. The thread is also suitable for general sewing, but note that 60wt and 90wt are finer than typical 50wt all-purpose thread. For regular garment construction, you might prefer a heavier bobbin thread to match your top thread strength.
Will white bobbin thread show through on dark fabric?
Sometimes, but rarely with 60wt or 90wt thread if your top tension is balanced. The bobbin thread lives on the underside of the fabric. On dark topstitching, you might see a faint white line along the edge of dense embroidery. To avoid that, wind your own bobbins with a dark thread. Prewound dark bobbins are available from some brands but less common.
How long do prewound bobbins last before the thread degrades?
Stored in a cool, dry place away from sunlight, these polyester bobbins last years. The plastic sides protect the thread from dust and humidity. I have bobbins from New brothread that are three years old and run exactly the same as new ones. Avoid storing them in a hot car or damp basement.
Are 90wt bobbins always better for fine details?
Not always. 90wt thread is thinner, so it leaves a lighter impression on the back. That helps with delicate designs. But if your machine’s tension is set for 60wt, switching to 90wt might cause loops on top or thread breaks. You may need to loosen the top tension slightly. For most home embroiderers, 60wt is more forgiving and still gives good results on fine work.