A PAIR(2) Gas Strut LEER truck topper rear door lift 15.89" extended length x 9.55 " compressed length x 34 LB Pressure Extended Length: 15.89" (center to center of ball socket ends) Compressed Length: 9.55" Force: 34 pounds of pressure (Per Prop) End Fitting: 10mm Ball Socket and 10mm Ball Socket Set of Two