A Pair of Camper Shell Cap SNUGTOP LEER Nitro-Prop Strut Spring Shock REP 23.05" extended length x 13.21 " compressed length x 45 LB Pressure Extended Length: 23.05" (center to center of ball socket ends) Compressed Length: 13.21" Force: 45 pounds of pressure (Per Prop) End Fitting: 10mm Ball Socket and 10mm Ball Socket Set of Two