If you already have a Stolen Sumo III sprocket, then add some protection with the Stolen Sumo Thermalite Sprocket Guard. Made from Stolen's proven Thermalite material, it will help protect your chain and sprocket teeth from damage during grinds or stalls without adding any additional drag. Includes chromoly hardware to make upgrading your Sumo III sprocket a breeze. Notes: This is for 25 tooth sprockets only. Specs: Material: Thermalite (Nylon with long glass fiber) Color: Black Weight: 2.5 oz Extras: Comes with hardware for mounting