Aircraft-grade 7075-T6 aluminium.Best quality material available.- Self-cleaning grooves between each tooth to prevent mud build-up.- One of the lightest sprockets on the market.- Color anodized coated surface for extra durability.- Race proven design with optimal strength-to-weight ratio.- CAD designed and CNC machined using state of the art technology.Made in EuropeSprocket Rear Alloy Moto Master Made in Holland