About this item 1??Perfect Quality Material: The spring performance of this shock damper is good, making your 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-working state, 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, sunny 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. Product Description 135/160/180/200/220mm Mini Shock Suspension Bumper Spring Shock Absorber Parts Rear Shock For Electric Scooter bicycle Minimoto ATV Pocket Bike E bike Item:135/160/180/200/220mm Rear Shock Color:Black Name:Rear Shock For Electric bicycle Electric Vehicle Accessories Rear Shock Absorption Motorcycle men’s scooter oi hydraudic comfort soft air bad rear spring shock absorber Spring size:6mm hole to hole size:10mm spring pressure:600lbs Note:this is spring only