Take charge of your bobbins with the Bobbin Holder Ring! This hollowed out donut-shaped ring is made of flexible rubber plastic that perfectly holds your bobbins nice and snug. The Bobbin Holder Ring prevents wound bobbins from unraveling or becoming tangled. Holds up to 20-30 bobbins. Fits most class 15 or style L plastic or metal bobbins. Bobbins pictured not included.