Features HIGH QUALITY MATERIAL: Brake housing set is made of alloy and plastic, strong and durable enough for long time use, resistant to cold, heat and oxidation, not easy to deform, ensure sensitive braking, suitable for most weather conditions. Riding skill Practical features: bike brake levers are durable, less burden on the bike to ensure a smooth ride, the brake kit is simple and portable, perfect for carrying around; Suitable for most mountain bikes and road bikes with brakes; Brake arm tension is adjustable,the frame/forks are in the right position, and it's easy to regulate the tension of the internal brake bow spring. [Product Information] Product Name Bicycle Brake System Product Material Plastic + Alloy Packing list (available with purchase of one item) Brake System Kit X1 (Black) Please understand: 1. due to the long transportation time, the goods may be damaged during transportation, if the goods are damaged, please leave us a message through the official website immediately before you post a comment, I will solve the problem for you. 2. Due to manual measurement, the size may have 1-3cm error. 3.Color may vary by monitor.