The bike shock absorber is of aluminum alloy material,durable,and not easy to break. The bike shock absorber have good damping function, you can buffer the road to the bike to bring the bumps, reduce the range of bumps. Effective protection of other parts on the car, so riding more able. 2 specifications for you choose. This rear shock absorber is a perfect enhancement to mountain bikes, electric bikes, mobility scooter and other bicycle. Rear suspension shock absorber, suitable for most mountain bikes with the same installation size. Feature: [Hollow design]:-The ergonomic hollow structure makes the bicycle seat more breathable. This is important for cyclists to reduce heat and sweat when riding long distances. At the same time, the pressure in the sensitive area can be reduced. [Shock absorption]:-has good shock absorption performance, strong and durable, and long service life. Simple and practical design, easy to install and operate, easy to use. [able]:-Soft and able cushion, su