Built-in hydraulic airbag, 24 segments adjustable soft and hard damping. Damping spring can adjust soft and hard, high comfort, super soft. Suitable for motorcycles with 2 piece rear shock absorbers. We will do our best to solve any problem and provide you with the best customer services. Operation of the coil-over springs and air cylinder is helpful to reduce the shock. Product Description Name: Motorcycle rear shock absorber Material: T6063 aluminum alloy Process: CNC precision numerical control Color: black size: Eye-to-eye core length: 320/340/360mm Eye diameter (with sleeve): 10 mm Eye thickness: 21mm Maximum tensile strength of eyes: 2,000 Kgf Spring width: 64mm Spring thickness: 7mm Working stroke: 55mm Spring stiffness: 110 kg Maximum load: 200 kg (440 lb) Air storage: adjustable Factory air pressure: 0.4 Mpa Maximum air pressure: 0.5 Mpa Number of pounds: 80 pounds per stick Installation position: rear shock absorption Installation method: straight up Package included: 1 Pa