A Pair of Camper Shell Cap SNUGTOP LEER Nitro-Prop Strut Spring Shock REP 18" extended length x 11.39 " compressed length x 38 LB Pressure Extended Length: 18" (center to center of ball socket ends) Compressed Length: 11.39" Force: 38 pounds of pressure (Per Prop) End Fitting: 10mm Ball Socket and 10mm Ball Socket Set of Two