The Original TULIPS 'BOBBIN HOLDER / CLAMP'...Keep bobbin thread tails under control' (12 Pieces) Package of 12 colorful clamps comes with an 8 inch metallic chain.(60 pcs Package available under Smartneedle) Works with the most preferred bobbin sizes (type L,class A and M ) These Clamps are made to last, High quality silicone that will hold bobbins tight to prevent unwinding Super easy to use and ergonomically design. Includes a metal chain for transportation or for organization.