Mounts inside an existing open coil spring suspension Durable polyurethane air springs Supports 500-1, 000 pounds per set Used on pick-ups (front), P-30 Motorhome (front), SUV's and cars Kit includes air springs, air line, fasteners, inflation valves (manual inflation), supports (if required), push-to-connect air fittings and detailed instructions Designed to work in temperatures between -40F (-40C) and 180F (82C)