About this item 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 Color:Round Hole pitch: 320 mm Eye diameter: 10mm Spring diameter: About 6cm Product color: As shown Applicable models: Universal for most of models with 320mm mouting hole pitch Function: 2 gas cylinders design,built- in nitrogen balloon, inflatable, shock and harden the hardness depends on the air inside the ball is full. Note: This product is measured by hand and may have an error of 1-3cm, Due to the screen and lighting configuration, the colors may be slightly darker or lighter. This type of motorcycle shock absorber is designed to reduce the vibration caused by rough roads.