Dtail size: Extended Length (Center-to-Center): 14.96" (380 mm); Compressed Length (Center-to-Center): 9.06" (230 mm); Force: 40 Lbs (178 N) Per Strut, 2 Struts included in Per Set; Package content: 2× Shocks, 1× Installation Guide are included in each set; Interchange Part Number: ARE 9093, C1619568, C16-19568 | Application scenario: C16-19568 15 inch Gas Spring can be used as the replacement parts of the ARE Camper Shell Rear Window, A.R.E Truck Cap, Truck Topper, ARE Topper, Pickup Cap Window, Truck Toolbox Lid and also can be used on other DIY Builds | Warn Tips: If you use the struts for your camper shell, please confirm the Interchange Number of your old sturts firstly or measure the the length from the center of the socket to the center of the socket before purchasing. | Suitable range of pounds: Most suitable support weight is between 30-44 pounds. Note: DO NOT compress them by hands before installing, the struts could only be compressed after installing successfully | 18 Months Support: If any questions or dissatisfactions before/after purchasing or need installing/using guide, please message ARANA directly to let us provide in-time assistance to you!