Feature: Reduces and softens the bumps in the road and the vibration when riding a motorcycle. The cylinder is filled with air instead of nitrogen. And you can use nitrogen according to what you need. The work of the coil springs and the air cylinder helps reduce the impact. The length of the shock absorber can be compatible with 10mm longer than its own length, such as 320mm fits for 320mm to 330mm motorcycle. Description: Product Name: Motorcycle Shock Absorber Color: Black Length (Eye to Eye): 320mm/12.6 inch Spring Thickness: About 7.4mm Spring Width: About 61mm Hole Inner Diameter: 12mm Fitment: Universally fits most 320mm motorcycle shock absorbers Please make sure this part fits your motorcycle before you bid. The kit includes: 2Motorcycle Shock Absorber 1Wrench 2Tubes