These air bags can hold up to 600 PSI and they are extremely durable and resistant to damage from wear and tear, inflation shock, or just outright abuse. Their outstanding construction provides extreme durability and reliability. Featuring a large ½" air port for fast response and a stroke of 9.7" for the best performance. In addition to the air bags, this kit will come with both air bag's fittings, two Schrader valves and 20 feet of ¼" OD nylon hose. Suspension Air Spring (Dual Pack) ½" NPT Single Air Port 3/8-16" UNC Mounting Threads 600 PSI Maximum Restrained Pressure 349-3055 lbs Load Range 9.7" Usable Stroke Included in this kit: 2600 Suspension Air Spring x 2 ½" NPT Male to Push to Connect (PTC) for ¼" OD Hose Swivel Elbow x 2 Schrader Valve with Push to Connect (PTC) for ¼" OD Air Line x 2 ¼" OD Nylon Hose 20 FT Dimensions: Height: 2.8" (Min) - 12.5" (Max) Diameter: 7" (0 PSI) - 8" (100 PSI) Never exceed more than truck manufacturers maximum load recommendations.