About this item 1 Perfect Material: The spring performance of this shock damper is good, mayour ride on the rugged mountain road smooth. The material is durable, the spring performance will not decrease after a long time using. 2 Just the Right Size: The spring is long enough, and the spring measures about 125mm/4.92inch long in non-worstate, so your ride on the bumpy road or uneven trail will not be a concern. 3 Weather Resistant Accessory: This bike damper has undergone anti-rust and anti-fatigue tests, so it is suitable for the rainy and snowy, weathers. 4 Lightweight &PracticalThe bike damper is lightweight for easy ride.It is designed for long ride and poor road conditions. 5 Easy to Install: The installation of the shock damper is simple and convenient, and also, it can be used as a modification accessory. 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.