This listing is for one brand new ThreadGuard Bobbin Case model XC3152221, designed to fit a variety of top load sewing machine models. It is compatible with numerous models including CS-100, CS-4000, CS-6000, CS-80, CS-8000, CS-8060, CS-8100, CS-8150, CS-8200, CS6000B, NC21-S2, NC21-S3, NV1000, NV1500, NV1500D, NV2500D, NV4000D, NV400D, NV5000D, NV500D, NX200, NX400, NX600, SE 270D, SE227D, SE350, SE400, NX200, NX400, NX600, CS8000-8200, and others. It also fits certain Babylock models such as BL40, BL40A Grace, BL137A Sofia, and BL137A2 Sofia 2, as well as various other models listed. This bobbin case is essential for proper sewing machine operation. If unsure whether this part fits your machine, please inquire before purchasing. We also sell the hook for this bobbin case separately; search our website for more details.