1Applicable Model: Rear drive sprocket is fit for SS50 CT70 CL50 CL70 CD50 CD90, please confirm whether your model is applicable before buying. 2High Durability: The rear drive sprocket is made of high strength steel alloy and has a thickness of 7mm to ensure overall durability and stable performance. 3Dimensions: 32T rear drive sprocket outer diameter is approximately of 5.3in, aperture of 2in, thickness of 0.3in. Please check the size carefully before you buying. 4Premium Replacement: Our rear sprocket has been gone strict test, can be used to replace old or damaged rear drive sprockets directly, ensuring a longer lasting chain and performance. 54 Rubber Cushion Block: While transmitting power, it plays a certain role in cushioning and damping, and can prevent the chain from being damaged and falling off due to direct contact with the rear hub.