1. Lightweight High-Performance sprocket for added horsepower to the Front wheel 2. Features self cleaning grooves to clear mud and increase sprocket life 3. All rear sprockets are made of 7075 -T6 aluminum alloy and anodized for even greater wear 4. Advanced tooth profile, concentricity and accuracy of fit provide maximum power transfer and long-life 5. It was made by machining centre which can gain more precise dimension and glabrous surface than common machine work. 6. We can skinpacking that is external appearance more beautiful. We can change the style according to customers' requirements. 7. This sprocket can be oxidated into various colors. 8. Able to change toothnumber for customers' requirements. Material: Aluminum, steel, Zinc, Brass, PlasticSurface treatment: Nickel plating, Zinc plating, Chrome plating, Oxidation, black coating, mill Tolerance: +/-0.02mm Inspection: We guarantee every single product at least 5 times of inspection processes Equipment: 4 axis processing center, Machine center, nc milling machine, CNC lathe, automatic cutting machine, thread cutting, milling machine, blister packaging machine Package: Plastic bag, Bubble bag, box, carton, wooden case, skin packing