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