There are three parts to it, all made of memory silicone, some sort of squashy rubber: Spool Huggers to keep thread on your spools from unraveling.

Bobbin Holders to keep color matching bobbins and spools together.

as separate sets of 20 pcs or buy the complete system as a high value bundle. Do you have a special system for organizing your spools and bobbins? Home made or bought? Let us know in the comment section below!