This is a Bobbin Winder protector that is designed to help protect your machine's bobbin winder when you traveling.

This works especially good when fitting into tight travel cases.

Designed with a curved area for whatever was going to hit it to slide off it.

I am sure if it was hit hard enough it could still break, but this just adds another form of protection.

This fits the New Bernina 4 Series, 5 Series & 7 Series machines. (Black bobbin machines, not 8 series).