Features: 1.This wire clip is made of soft silicone, durable and reusable, has a long service life. 2.This product is used to organize threads and keep them tidy, saving time to find small gaps in the bobbin to catch the thread. 3.Suitable for most sewing and embroidery spools (except large commercial or super large spools); 4.The clips are very suitable for clamping on the spool or removing it from the spool. When the bottom thread is not used, it can prevent the bottom thread from separating. 5.Prevent the bobbin thread from unraveling and knotting, and make sure that the bobbin is neatly stored and organized. specification:Item Type: Spool Fixing Clip : 40 x Spool Fixing Clip(10 x Yellow, 10 x Red, 10 x Blue, 10 x Green) PackageList:40 x Spool Fixing Clip(10 x Yellow, 10 x Red, 10 x Blue, 10 x Green)