Features: Efficient braking enhances Cycling safety and is suitable for various types of bicycles. Consist of wear-resistant component, durability; Easyly to install. Suitable for professional cyclists and bicycles enthusiasts who pursues high performances and safety. Suitable for various cycling environment such as commuting, mountain biking, and long-distances travel. The unique ventilation of the disc brake Rotors help accelerate air circulation around the brake and facilitates heat dissipation. Specifications: Color:Three Elections Dimension:14mm/5.51in 160mm/6.3in 18mm/7.09in Component:Metal Note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you will not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual color. Package includes: 1Set Bicycles disc brake