4 extra tall 2500lb air bags. Single, 1/2npt port. Titan2 series air spring by airmaxxx. 1/2NPT Single Port Suspension Double Convoluted Air Bag. Specs of each bag: 2 Ply, 2500 LBS Diameter 6.5″, Extended 11.1″, Closed 3.5″ Top & Bottom Mounting Holes Measure Approx 1-3/4″ from Eye to Eye Bottom Also Includes One Mounting Hole in Center All mounting holes are 3/8-16 UNC.