All of our chainrings are CNC-machined in the USA from premium 6061 aluminum — not stamped, like other brands. The end result is a truly round, truly flat gear that is manufactured to the same exacting tolerances as our other components. What does this mean to you as a rider/racer? More consistent chain tension, and a smoother, more efficient pedal stroke — on the track, on the trails, on the street, or anywhere in between. Available in 6 colors and multiple tooth configurations; 5mm thick.