Features: 1.The internal structure is simple and precise. Gas as the main shock absorber provides good sliding properties. 2.According to the needs of the rider, the weight of the shock absorber can be adjusted by adjusting the main air chamber (MP), and the air pressure of the negative air chamber can be adjusted to adjust the fisheye bearing design to solve the tolerance and deviation of the car body. 3.Made of high quality material,durable and long lasting. 4.Best accessory for Moutain Bike. Notice: Actual color may be slightly different from the image due to different monitor and light effect Please allow 1-3cm deviation due to manual measurement Material:Aluminum Alloy Size:125/150/165/190MM includes: 1x Back Shock Absorber 1 set x Accessory