Feature:1. Made of soft silicone, durable and reusable, used to organize threads and keep them tidy.2. Easy to use, just stretch the spool saver and hug the spool within a second, the spool does not need to be completely covered.3. Saves time to find small gaps on the bobbin to catch the thread, ideal for clamping on or removing from the spool.4. Can be used for most sewing and embroidery spools (except large commercial or oversized spools).5. Helpful to prevent the thread from separating, can prevent the bobbin thread from unraveling and knotting.Specification:Item Type: Bobbin BuddiesMaterial: Silicone+PlasticApplication: Suitable for sewing machine spool retainer.Package List:100 x Bobbin Holder