High-Quality Torque HD Air Spring Helper Suspension Kit – Kit includes 2 air springs, all brackets, installation manual, bolts and nuts. No need to drill. Increase stability and improve ride quality – Keep your vehicle level when you are hauling a heavy load – Improve steering control and braking when you are hauling or towing – Reduce tire wear – Reduce strain on rear suspension – Air helper springs will not increase your vehicle’s weight-carrying capacity. 5 psi to 100 psi.