A. Features: B. Made of 7075 aluminum, which is lightweight, durable and precise. C. Ultralight and will not add too much weight to your bicycle. D. Easy installation, a direct replacement for the old or broken one. E. The appearance is simple, generous and colorful. Suitable for Rotor 130BCD Road Bike. F. Road Bike Chainwheel only, other accessories demo in the picture is not included. G. Specification: H. Material: 7075 Aluminum I. Optional Size: 50T, 52T, 54T, 56T, 58T, 60T J. 50T Size: app.20.9x20.9x1cm/8.23x8.23x0.39in K. 52T Size: app.21.6x21.6x1cm/8.50x8.50x0.39in L. 54T Size: app.22.5x22.5x1cm/8.86x8.86x0.39in M. 56T Size: app.23.3x23.3x1cm/9.17x9.17x0.39in N. 58T Size: app.24.1x24.1x1cm/9.49x9.49x0.39in O. 60T Size: app.24.9x24.9x1cm/9.80x9.80x0.39in P. Color: Black Q. Quantity: 1 Pc R. Note: S. No retail package. T. Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. U. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you V. Package Contents: W. 1 x Road Bike Chainwheel