Made from Japanese SCM420 chromoly steel alloy. Heat treated and hand finished to meet or exceed OEM standards. Outlasts any mild steel or surface hardened sprocket. Each sprocket goes through 10 quality control checks before it leaves the factory. JT Sprockets are manufactured the right way – by hobbing, machining and drilling; this is the only proven way to achieve the closest of tolerances and the most accurate teeth profiles. Made from Japanese SCM420 chromoly steel alloy Heat treated and hand finished to meet or exceed OEM standards Outlasts any mild steel or surface hardened sprocket Each sprocket goes through 10 quality control checks before it leaves the factory JT Sprockets are manufactured the right way – by hobbing, machining and drilling; this is the only proven way to achieve the closest of tolerances and the most accurate teeth profiles ASIN B084H1QV4D Brand JT Model JTR251.46 Exterior Machined Item Weight 1.66 pounds Manufacturer JT Sprockets Item model number JTR251.46 Product Dimensions 1 x 11 x 11 inches Manufacturer Part Number JTR251.46 Is Discontinued By Manufacturer No