A Pair of Gas Prop Lift Springs Rod Struts Heavy Duty Tool Box Lid Top RV 11" extended length x 7.5 " compressed length x 30 LB Pressure Extended Length: 11" (center to center of ball socket ends) Compressed Length: 7.5" Force: 30 pounds of pressure (Per Prop) End Fitting: 10mm Ball Socket and 10mm Ball Socket Set of Two