Industrial bobbin case I-2 type, steel, hardened for high-speed rotation. - Product Name: Bobbin Case I-2 type - Application: Industrial - Compatible Models: Clover Bobbin I-2 type - Material: Body: Steel, Case: PE - Features: Hardened for high-speed rotation - Manufacturer: Clover Co., Ltd. Thank you for viewing. I purchased this at Otsukaya six months ago, but I no longer need it because I bought a new sewing machine. It has not been opened. I hope someone who can use it will take it.