Apexstone 100N/22.5lb Gas Struts,Gas Springs,Gas Strut,Lift Support,Gas Shocks,Lid Stay,Lid Support,Set of 4 Lids soft open gently,Ideal for supporting the lid to keep it open Pressure:100N/22.5lb (Per Strut);Length ( hole center to hole center) :9-11/16'';Travel:3-14/25'' ,Distance between ball mounts compressed: 6-1/8" Support opens lids to a maximum angle of 100 degrees Instructions Included, Screws Included We offer 1 YEAR 100% SATISFACTORY WARRANTY, if unfortunately our SOFT OPEN LID GAS STRUT did not work well ,please kindly contact us for exchange, refund or return