The Brewer Pneumatic Stool with Backrest features a 5-legged base, 16-inch round seat cushion, and 360 degree circular ring adjustment.
 
4″ poly-foam seat cushion for maximum comfort
16″ wide seat cushion
21″ five leg ABS black base
2″ dual wheel casters
Backrest Dims: roughly 16″ W x 10″ H
Adjustable height range: 21″ – 28.5″ (measured from floor to highest point of seat)
360-degree ring height adjustment
Cylinder height range: 20-26″
250 lb capacity
5-year warranty