Bobbin Bikinis by Fabric Cafe STOP BOBBIN TANGLES! Now you can slip stretchy little bands over your bobbins and toss them in a drawer and they won’t tangle. Match them to the color of thread you’ve wound on your bobbin. Bikinis can also be used on spools of thread. Just slip them over the ends of thread, and WALA!… No more tangles. You get 30 Bobbin Bikinis in each package.