Bobbins EmbSupplies.com offers a large selection of prewound bobbins for all different types of embroidering applications. We stock both the economical spun polyester type (good strength, coarser texture) and the filament polyester type (extra smooth, extra strong). Please note: We only carry the standard "L" sized bobbins (.75 inch diameter) which are used on most embroidery machines. Please note: some Tajima and Brother machines use a larger/jumbo "M" sized bobbin (1 inch diameter), so please be aware if you own one of these models.