Features: Pressure can be adjusted by springs and air (nitrogen). High quality,high-performance motorcycle parts. The damper and spring designed for long durability. Reduce bumps in the driving of motorcycles. Easy to install.Specification: Product Name: Shock Absorber Color: Black Material: Aluminum+Iron Total Length: 370mm/14.56″ Eye Core Length: 340mm/13.38″ Eye Diameter: 12mm/0.7″ Eye Thickness: 20mm/0.78″ Spring Thickness: 8mm/0.31″ Spring Width: 60mm/2.36″ Working Stroke: 68mm/2.67″ Factory Air Pressure: 0.4 Mpa Maximum Air Pressure: 0.5 Mpa Air Reservoir: Adjustable Placement On Vehicle: Rear Left & RightFitment: For work on most 150cc~750cc street bikes, karting(go kart), scooters and moped quad (ATV) with shocks of 340mm eye to eye distance.Package Includes: 2 Shock Absorbers 2 Eye Cores 1 Adjust Spring Tools