High Surface Finished Spherical Plain Bearing (Fish-eyes Bearing) Compatible with most 50/70/110/125/140/150/160cc Dirt Pit Bike Trail Bike Dirt Bike Thumpstar Gokart Moped and scooter. Aluminum Alloy Material Spring is Adjustable High Quality Surface Finished Spherical Plain Bearing (Fish-eyes Bearing) Compatible with most 50/70/110/125/140/150/160cc Dirt Pit Bike Trail Bike Dirt Bike Thumpstar Gokart Moped and scooter. Aluminum Alloy Material Spring is Adjustable Adjustable rebound F (fast) and S (slow) at the bottom of the shock 270mm Rear Shock Absorber Parameters Eye To Eye Length: 270mm/ 10.63″ Spring Diameter: Approx, 71mm/ 2.80″ Spring Thickness: 12mm/ 0.47″ Spring Rate: 1000LBS Mounting Hole: 10mm/ 0.39″ Mounting Hole Thickness: 20mm/ 0.79″ Adjustments: Rebound / Preload What`s included in package 1pc 270mm shock absorber Note: In order to ensure the performance of the Shock Absorber, the item comes with hydraulic oil. B