A Pair of Round Hole 400mm Aluminum and Solid Steel Shock AbsorberPressure can be adjusted by springs or air (gen); Operation of the coil-over springs and air cylinder is helpful to reduce the shock.Shock Absorber bottom/ends type: Round EndNo instruction included, professional installation recommended.Universal fit for most 400mm Motorcycle Shock Absorber For Honda/Yamaha/Suzuki/Kawasaki;Dirt bikes, Gokart, ATV, Motorcycles and Quad.Color:Silver and Black | Size:400MMDescription: Dimension: Total Length: 430mm (17″) Length of Eye to Eye Core: 400mm (15 3/4″) Eye Diameter(with bushing): 12mm Eye Diameter(with bushing removed): 16mm Eye Thickness: 21mm Eye Maximum Tensile Strength: 2,000 Kgf Spring Thickness: 7mm Spring Width: 60mm Working Stroke: 68mm Spring Stiffness: 110 kg Maximum load: 300 kg (660 lbs) Air Reservoir: Adjustable Factory Air Pressure: 0.4 Mpa Maximum Air Pressure: 0.5 Mpa A complete pair RFY air gas shocks absorbers Easy to install,no Installation Instructions Pres