Top Medical Pneumatic Exam Stool 21" - 28.5" - Black Vinyl - Black Casters 15 Year Warranty - Lifetime on Cylinder - 5 Year Upholstery Height: Medium Bench Height 21"-28 ". 360 "All-Around" pneumatic height adjustment ring allows you to adjust the height from anywhere you reach under the seat. Height measured from the top of the seat to the floor. Seat: Width 17", Thickness 3 ". Base: Durable 5-leg 24" fiberglass reinforced nylon base. Casters: Comes with standard black rolling, non-marring casters (suitable for both hard and carpeted floors). 50 Vinyl and 5 Fabric colors available. Vinyl: Highly durable molded polyurethane foam cushioning covered with fully washable antibacterial/antimicrobial vinyl. Our upholstered vinyl chairs are protected by an industrial strength stain resistant finish. Exceeds ANSI / BIFMA standards. Weight capacity: 300 lbs. Made in the U.S.A.