Brewer 9000 Series Ergonomic Operator's Stool • Contoured ratchet adjusted backrest with layered polyfoam to provide ultimate comfort and lumbar support • Contoured, shallow seat pan w/ fully adjustable tilt provides correct weight distribution, pelvic tilt, and posture perfect comfort • Pneumatic height adjustment 17"- 22.5" • Adjustable synchronized traversing movement of seat and backrest • Deluxe powder coated cast aluminum base • Completely shrouded for asepsis • The ultimate in dental seating design and comfort • 5-year warranty