The BobbinSaver® Bobbin Holder is a simple, convenient way to store metal or plastic standard bobbins. Shaped like half of a bagel and hollowed out, it is made of flexible rubbery plastic that can expand to accommodate several different sizes of bobbin. Threads won't tangle or unwind, and BobbinSaver holds more than 20 bobbins securely. Unit measures 3/4 in. tall and 5 1/8 in. in diameter.