BobbinSaver™ Bobbin Holder holds metal or plastic bobbins of all different sizes! Shaped like half of a bagel and hollowed out, it is made of flexible rubbery plastic that expands to receive the bobbin and promptly snugs up around it. Threads won't tangle or unwind. BobbinSaver™ holds over 20 bobbins securely. BobbinSaver™ is a simple elegant gadget to store any kind of bobbin. Unit measures 3/4in tall and 5-1/8in diameter. -- Bobbins not included.