The United MDLCLS Sprocket Guard is a direct replacement for their 'Middle Class' Sprocket, built and designed to not take anything away from the original design. The MDLCLS Guard is built from CNC machined 6061-T6 alloy to ensure it can take whatever is throw its way. ###section### Product Specs TYPE: Guard MATERIAL: Alloy WEIGHT: 110g (3.92oz)