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 shown in the picture are not included. Specifications: Material: 7075 Aluminum Optional Size: 50T, 52T, 54T, 56T, 58T, 60T 50T Size: approx. 20.9 x 20.9 x 1 cm / 8.23 x 8.23 x 0.39 in 52T Size: approx. 21.6 x 21.6 x 1 cm / 8.50 x 8.50 x 0.39 in 54T Size: approx. 22.5 x 22.5 x 1 cm / 8.86 x 8.86 x 0.39 in 56T Size: approx. 23.3 x 23.3 x 1 cm / 9.17 x 9.17 x 0.39 in 58T Size: approx. 24.1 x 24.1 x 1 cm / 9.49 x 9.49 x 0.39 in 60T Size: approx. 24.9 x 24.9 x 1 cm / 9.80 x 9.80 x 0.39 in Color: Black Quantity: 1 Piece Notes: No retail packaging. Please allow 01 cm error due to manual measurement. Please ensure you are comfortable with this before purchasing. Due to differences in monitor displays, the image may not reflect the actual color of the item. Thank you. Package Contents: 1 x Road Bike Chainwheel