Slam Specialties Air Bag SS-8 Series Single Port 250 PSI -30% Thicker Sidewall than RE Models -Over 1 More Stroke than RE Models -Up to 40% Lighter than RE Models -Lightest Bag in its Class -Air ride assist for Trucks, SUV's & Trailers -Load Leveling for Hauling or Towing -Adjustable ride control for Slammed or Skyed Vehicles -Fast Response and control through (1) 1/2" NPT port -Vibration Isolation Includes: 1 Air Bag