Features: 1.The bobbin thread clips are made of soft silicone, which are durable and reusable. 2.After using the spool huggers, just stretch the spool saver and hug the spool within one second, the spool does not need to be completely covered. 3.This bobbin thread clamps can be used for most sewing and embroidery spools (except large commercial or extra large spools). It saves time to find small gaps on the bobbin to catch the thread. 4.The thread spool huggers suitable for clamping on the spool or removing it from the spool. When the bottom thread is not used, it is helpful to prevent the bottom thread from separating. 5.This clamps prevent the bobbin thread from unraveling and knotting, and ensure that the bobbin is neatly stored and organized. specification:Item Type:Clamp Thread Saver Function: Suitable for sewing machine, spool storage device : 48Pcs, random colors Material: Silicone PackageList:48 xSilicone Bobbin Clip