Self-Cleaning steel front sprockets are manufactured to exacting tolerances and designed with special self-cleaning grooves for added life and performance. A unique self-cleaning design keeps the contact area clean from dirt and mud while significantly reducing weight. Made from Japanese SCM420 chromoly steel alloy, heat treated, and hand finished to meet or exceed OEM standards. 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.