Winch Plate Stamped Bumper 2013-2018 Wrangler (RUG11543.15)ORV only uses nitrogen charged gas shocks for all their kits. Though a little more money, the nitro gas shock in combination with the ORV kits provide a better ride both on and off road. By using an ORV lift kit and matching gas shocks, you optimize the suspensions capabilities giving you a better ride both on and off road. 150 PSI pressurized Nitrogen gas Internal valves the internal orifice will rotate when the piston moves more than 2 in.