Description: It can run at higher speeds with less vibration and preventing unraveling or tangling of bobbin thread when sewing operations stop and start. Improve the efficiency and make your projects looked sophisticated. Specification: Material: Stainless Steel Weight: 62g/2.2oz Diameter: 3.4cm/1.3inch Height: 2.6cm/1inch Color: Silver Applicable Model: (as follow) Suitable for : #196R, #5550N, #8500N, #ZJ-100 Suitable for #B706, #B714, #B735, #B736, #B755, #B757, #B758, #B777, #B781, #B792, #B795 Package List: 1 x Sewing Hook Bobbin Case