What is the difference between 60 and 90 weight?

90 weight thread is thinner than the 60 weight. 60 weight is good for machine stitching. 90 weight is better for quilting, embroidery and fine hand stitching.

Will your size L prewound bobbins work on an older machine that uses Class 66 bobbins?

IDK - I use in my 20 y/o Brother without problem - if your machine take the L size they should work.

Are these Janome Mb4s compatible?

Yes, as we checked , these size L bobbins can fit with Janome mb4s machine.

Will these work with a singer featherweight 221?

I would not think so. I do not believe there prewound bobbins are available for the Singer Featherweight.

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🧵 Sew Smart, Sew Stylish — Never Run Out of Thread Again!

BULK PACK BRILLIANCE - 144 bobbins in one sleek box—always be ready to create without interruption or last-minute runs.
PURE WHITE PERFECTION - Classic white thread that elevates every DIY embroidery and sewing project with clean, professional results.
EFFORTLESS COMPATIBILITY - Fits major commercial & home embroidery machines—check your manual, then sew with confidence.
ULTRA SOFT 90 WT POLYESTER - Gentle on skin and fabric alike—experience premium softness that lasts through every stitch.
CRYSTAL CLEAR PLASTIC SIDES - No oil absorption or distortion; keeps bobbins pristine and organized for seamless workflow.

New brothread offers 144 prewound Size L (SA155) bobbin threads in pure white, crafted from ultra-soft 90wt spun polyester. Designed with durable plastic sides to resist oil and distortion, these bobbins fit a wide range of commercial and home embroidery machines, ensuring smooth, professional stitching every time. Packaged for convenience and longevity, this set is a must-have for serious sewing enthusiasts and pros alike.

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