Suspension Seat Assembly Air Suspension Seat Universal Application Standard Features Max Suspension Stroke, Up snd down movement:60mm which is 2.36" D.C.:12V Weight Capacity: 50KG-130KG Backrest folding forward Adjustable back angle:135? Adjustable headrest height to offer better back support: 6 steps, 120mm(6*20mm) Adjustable Armrest Air Suspension adjustable to driver's weight to offer better ride Fore & Aft adjustment:240mm MOUNTING SIDE TO SIDE 13" MOUNTING FRONT TO BACK 11" AND 11-3/4 COMES WITH BUILT IN 12 VOLT AIR COMPRESSOR