Product Description Features HIGH QUALITY MATERIAL: The brake housing set is made of alloy and plastic, strong and durable enough for long-term use, resistant to cold, heat and oxidation, not easy to deform, ensures sensitive braking, suitable for most weather conditions. Riding Skills Practical Features: bicycle brake levers are durable, less burden on the bike to ensure a smooth ride, the brake set is simple and portable, perfect for carrying around; Suitable for most mountain bikes and road bikes with brakes; The brake arm tension is adjustable, the frame/forks are in the right position, and it is easy to regulate the tension of the internal brake arch spring. [Product Information] Product Name Bicycle Brake System Product Material Plastic + Alloy Packing List (available when purchasing a product) 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 a message to us through the official website immediately before posting a comment, I will solve the problem for you. 2. Due to manual measurement, the size may have 1-3 cm error. 3. The color may vary depending on the monitor.