BQLZR 750lbs Mountain Folding Bike Rear Suspension Shock Spring Absorber Replace a poorly functioning rear shock on your mountain bike with new Shock Absorber. Please make sure that the spring nut has been against the spring before riding. Length: 150mm (6inch) eye to eye. lb/in: 750(Recommend body weight:50-60kg) The color of the item may vary slightly due to photography and your own computer.