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JT Sprockets is the world's leading manufacturer of aftermarket sprockets, constantly raising the industry's standards for quality and service. SC Lightweight Steel Rear Sprockets The new standard in steel rear motocross sprockets. A unique self-cleaning design keeps the contact area clean from dirt and mud while significantly reducing weight. Made from heat-induction hardened C45 steel which lasts up to six times longer than a 7075 aluminium sprocket and greatly extends chain life.