Convenient removal The bobbins are easy to see and remove. It is easy to remove a bobbin by hand, no tangling or unwinding the thread. Stay in place The cans fit snugly into the soft plastic channel and stay in place, even if turned over. Bobbin storage prevents the bobbin thread from loosening or deforming without a paper tube Time saving for sorting The bobbin is suitable for most bobbins.Spool clamps work on most home sewing and sewing thread spools, saving you time sorting it. Storage Bobbin Storage This is a storage system worry-free bobbin threads, which prevents the bobbin threads from unraveling or tangling. Quality GuaranteedThe bobbin storage is made of soft silicone, durable and reusable for life, allowing the thread to be organized and tidy. Features:High quality material, soft silicone, durable and reusable for life, keeping the thread organized and tidy. Worry-free bobbin storage, prevents bobbin threads from unraveling or tangling. Bobbins are easy to see and remove. It is easy to remove a bobbin by hand, no tangling or unwinding of the thread.Fits most spools, the bobbin bobbins work on most spools of home sewing and embroidery thread, allowing saves time sorting the bobbin. Bobbins fit snugly into a flexible plastic channel and stay in place, even if turned over. Bobbin storage prevents bobbin thread from loosening or twisting without paper tube. Specification: Condition: Brand New Material: Silicone Color: as shown in the picture Outer ring diameter: about 13.5cm Inner ring diameter: about 9cm Package list: 20 x bobbin 1 x bobbin storage box