Lightweight CNC machined aluminum for significant weight savings. Tusk rear aluminum sprockets are made from a high-strength aircraft grade aluminum alloy. Tusk Sprockets are anodized, and heat treated for extended wear. CNC machined to match OEM sprockets for a perfect fit. 7075 T6 Anodized Aluminum. Tusk Rear Aluminum Sprocket 50 Tooth Black For Kawasaki KX85 2001-2024.