Made of high material for durability and stability Pressure can be adjusted by springs or air (nitrogen); Operation of the coil-over springs and air cylinder is helpful to reduce the shock No instruction included, professional installation recommended The suspension leg provides a smoother ride and better shock absorption management. The spring seat is insulated from the spring to ensure a quiet and comfortable ride The suspension shocks struts provides a smoother ride and better overall damping management A precision made part for strength and durability This suspension provides a smoother ride and better overall damping management Fits many other bikes with similar dimensions and poundage. Measurement(approximately) : Eye center to center: 235mm Mounting hole diameter: 10mm Package 1pcs shock absorber Note: This product is measured by hand and may have an error of 1-3cm, which is based on the actual product. If you have any questions, please feel free to email! This t