Pressure can be adjusted by springs and air (nitrogen). The eye of shock has tensile strength more than 2000kgf. The dumper and spring designed for long durability(mor than 1 million). The point of performance and price comfortable,stable, high quality,high-performance motorcycle parts. Fitment: Universal fit for most 430mm Motorcycle Shock Absorber. 435mm (17.13″) total length 420mm (16.54″) e96ye to eye center Eye Diameter: 12mm Package included: 2pcs Shock Absorber 2pcs 10mm copper rings 1pcs wrench Please check the size and ensure this part fits for your motorcycle before bidding. Fitting manual is not included. installed by qualified mechanic is recommended. Notice 1.Please allow 1-3mm error due to manual measurement.Pls make sure you do not mind before you bid. 2.The color may have different as the difference display,pls understand. This type of motorcycle shock absorber is designed to reduce the vibration caused by rough roads.