ThreaDelight ™ M-size prewound bobbins for commercial machines
White prewound bobbins, sideless, with plastic core. Each M-size bobbin includes a 274 yards of quality, long-fiber polyester thread.
You may now stop winding bobbins and get them ready, pre-wound for you. Naturally, this saves plenty of time. Also, ready bobbins usually work much better that ones that your machine can wind, as they are wound tighter and better.