With a patented, protective locking feature which prevents threads from unraveling, the Bob-EEZ no-tangle bobbins are an essential addition to your bead crafting tool kit. Stackable and made from a soft plastic material, use these bobbins to secure loose ends as you work.Details:Includes assorted sizes8 bobbinsStackableProtective locking feature prevents unravelingPlasticSize Information:2.5" (6.35 cm) - 4 bobbins1.875" (4.76 cm) - 4 bobbins