●A Pair of Round Hole 320mm Aluminum and Solid Steel Shock Absorber ●Pressure can be adjusted by springs or air (nitrogen); Operation of the coil-over springs and air cylinder is helpful to reduce the shock. ●Shock Absorber bottom/ends type:Round End ●No instruction included, professional installation recommended. ●Universal fit for most 320mm Motorcycle Shock Absorber For Honda/Yamaha/Suzuki/Kawasaki;Dirt bikes, Gokart, ATV, Motorcycles and Quad. Please check your mounting measurement before purchase.