Bicycle seats should only be used for children who can sit down without effort The seat must be attached to the back of the frame tube sleeve and always face forward 5-point seat belt The seat can be installed on bicycles with 26" and 28" wheels The seat is suitable for round tubes with a diameter of 22 mm to 40 mm This child seat is suitable for children with a total weight of less than 22 kg (48.5 lbs) This seat cannot be attached to frames with square or rectangular sections The seat cannot be installed on bicycles with a brake bar Mounting hardware not included Material: PP, PE, nylon, steel Color: gray