Stool with chrome base pneumatically adjusts to accommodate desk-height and counter-height activities from 27" to 34". Over sized tractor-shaped seat is made of PVC-coated gel molded onto a metal frame. Stool holds 250 lb. Functions include pneumatic seat-height adjustment and 360-degree swivel. 26" five-star chrome base has an adjustable foot ring and 2" dual-wheel carpet casters. Backrest is sold separately.