A Pair of Gas Prop Lift Springs Rod Struts Heavy Duty Tool Box Lid Top RV 17" extended length x 10.25 " compressed length x 20 LB Pressure Extended Length: 17" (center to center of ball socket ends) Compressed Length: 10.25" Force: 20 pounds of pressure (Per Prop) End Fitting: 10mm Ball Socket and 10mm Ball Socket Set of Two