(2) 17 inch 120 lbs Gas Prop Lift Springs Rod Struts Heavy Duty Tool Box Lid Top RV Pair Red Hound Auto Gas Charged Lift Supports Pair Open Length: 17 in; compressed: 11 inches Stroke Length: 6 inches Rod Diameter: 8mm || Force: 120 lbs Easy Installation; Compatible with 10mm Ball Mounts (not included)