GRABBIT BobbinSaver M Class holders keep large-format bobbins together to reduce loose thread tails and drawer clutter. The flexible circular channel holds over 20 M-class bobbins measuring about 1 inch or larger in diameter, in a compact ring. Insert bobbins with light pressure, and if the channel loosens over time, reshape it as directed by the manufacturer Store in a dry place between uses Keep out of reach of children when not in use.