This purple bobbin ring holds 30 prewound transparent plastic sewing machine bobbins in 30 different bright colors. The ring prevents the bobbin threads from unwinding or becoming tangled. The ring is made out of thermoplastic rubber– a soft pliable material. The bobbins all stay in place when the ring is turned upside down or when it falls on the ground. The bobbins are easy to see, to take out, and to replace. This ring is a great solution for the safe and orderly storage of your bobbins. Each professionally prewound bobbin holds 42 meters of 100% polyester all-purpose sewing thread (40S/2). These bobbins hold more thread than a home-wound bobbin and have a smooth, uniform wind. The convenience of popping in a new bobbin without spending time to wind it is priceless.

The bobbin ring is ¾ inch tall and 5 ⅛ inch in diameter.