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JT Aluminum Racing Rear Sprockets are made of superior-quality aviation-grade 7075 T6 light-weight aluminum steel. They feature a CNC-created compact design to achieve optimum efficacy and great long- lasting service to your dirt bike. The all-aluminum MX rear sprockets for dirt bikes are hand-crafted and offer a smooth ride. They also feature a unique self-cleansing mechanism that ensures dirt and mud do not clog the sprockets. Which results in increasing the effectiveness of the engine power that flows to the wheels.