MATERIAL: Aluminum alloy, sturdy and solid; WIDE RANGE OF APPLICATIONS: Suitable for most types of mountain bike and road bike; EFFECTIVE PROTECTION: After fixed on the rack, it can protect the transmission after dialing; EASY TO INSTALL: The upper end of the tail hook is connected with the frame, and the lower end is connected with the rear dial of the transmission; NOTICE: Please compare the parts you need to replace to see if their size and shape match. Specifications Color: silver Weight: 10g Material: aluminum alloy Product Type: Bicycle Accessories Includes 1 x bicycle tail hook