I purchased thirty (yes thirty) generic bobbins for my Juki from Sewing Parts Online and I've been using them for about a year with absolutely no problem. I hate winding bobbins so I bought enough to have two bobbins with each color except for white, off white and light gray, which have six bobbins each. I also purchased ten generic bobbins for my Janome all they also work great. I would definitely buy generics again.