The JT SC Lightweight Rear Sprocket is a revolutionary steel off road sprocket, setting a new standard for steel rear motocross sprockets. Features a unique self-cleaning design that keeps the contact area clean from dirt and mud while significantly reducing weight over traditional steel sprockets. The Heat-Induction hardened C45 steel sprocket lasts up to six times longer than 7075 aluminum sprockets and greatly extends chain life. Engineered and finished to the highest quality level in black zinc by JT Sprockets, the world's largest sprocket manufacturer. All the durability benefits of a steel rear sprocket without the weight penalty.