Force: 18lbs/80N(Per Strut), 2 struts is 36 lbs/160N. It could hold open 18 lbs individually or together for around 36lbs on any object such as car lid, RV, which is universal. Length: Extended Length(Center-to-Center): 6.7'/17cm, Compressed Length(Center-to-Center): 4.72'/12cm. Easy Installation: We have installation quick guide for you. If you have question about the strut force or any other question, please contact us before buying, we will provide you with professional advice. Note: Do not compress them by hands before installation, the struts could only be compressed after installing successfully. After installation, the lid/cover would be opened or closed smoothly. Working temperature: -25 Degree Celsius70 Degree Celsius. Package Included: 2 x Gas Struts, 4 x Connector Gaskets, 10 x Screws.