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:Silver+Black Material:Aluminum+Iron Total Length:310mm/370mm/350mm/410mm/430mm Eye Core Length:280mm/340mm/320mm/380mm/400mm Eye Diameter:12mm Eye Thickness:20mm Spring Thickness:8mm Spring Width:60mm Working Stroke:60mm Factory Air Pressure:0.4 Mpa Maximum Air Pressure:0.5 Mpa Air Reservoir:Adjustable Placement On Vehicle:Rear,Left,Right Fitment:Universal Motorcycle Eye To Eye Length 280mm. (Please Compare With Your Original One Before Purchasing!) Package Includes: 2 X Shock Absorbers 2 X Eye Cores 2 X Adjust Spring Tools Note: This product is measured by hand and may have an error of 1-3cm,which is based on the actual product. Due to the screen and lighting configuration,the colors may be slightly darker or li