Skyjacker Softride Nitro shocks are 150 PSI Nitrogen Gas Pressurized. They feature multi-stage velocity sensitive valving, twin tube construction, oversized piston head, internal rebound bumper, 5/8 diameter hardened double chrome rod, urethane bushings and compression control which prevents the formation of air bubbles to reduce fade. Skyjacker has set a high standard of uncompromising quality in the development of this high-performance shock absorber. We use this shock mostly in heavy-duty applications for severe off-road use. It's a little stiff for most street applications. All shocks are white in color and include a red polyurethane boot. *Shocks are sold individually.