The RNC 7075 Aluminum Full Bash Sprocket is machined from alcoa usa made 7075-T6511 aluminum. If you're wondering what alcoa aluminum is don't worry, so were we, it's a company that produces aluminum, I think. Anyway, this sprocket is made of strong aluminum that is compatible with the Profile universal adapters, however it is shipped with the 24mm / 80 spline adapter that is proprietary an used in conjunction with the RNC cranks. 

• Weight: 6oz (25T)