A Pair of Camper Shell Cap SNUGTOP LEER Nitro-Prop Strut Spring Shock REP 17.5" extended length x 11.25 " compressed length x 101 LB Pressure Extended Length: 17.5" (center to center of ball socket ends) Compressed Length: 11.25" Force: 101 pounds of pressure (Per Prop) End Fitting: 10mm Ball Socket and 10mm Ball Socket Set of Two