A Pair of Gas Prop Lift Springs Rod Struts Heavy Duty Tool Box Lid Top RV 29.5" extended length x 17.75 " compressed length x 200 LB Pressure Extended Length: 29.5" (center to center of ball socket ends) Compressed Length: 17.75" Force: 200 pounds of pressure (Per Prop) End Fitting: 10mm Ball Socket and 10mm Ball Socket Set of Two