The BobbinSaver will save you time and limit frustration. The flexible plastic design allows both metal and plastic household sewing bobbins to securely fit inside and keeps them from becoming tangled and unwinding. This bobbin case can hold 60+ bobbins. The open top makes it easy to identify which bobbin you want to remove. Each BobbinSaver measures 3/4“ tall and 5 1/4“ by 5 1/2" square. Bobbins not included.