This multi-shift ergonomic drafting stool from OFM can handle continuous sitting 24 hours a day 7 days a week, great for government, healthcare or dispatch centers that require around-the-clock staffing. Other features include thick foam padded seat and backrest cushions that are ergonomically contoured for comfort, one touch synchronized seat/back adjustment, adjustable height backrest, built in lumbar support, durable easy clean anti-microbial vinyl upholstery, pneumatic seat height adjustment, 360 degree swivel, optional height adjustable T-shape arms and a heavy duty five star nylon base with dual wheel carpet casters. Meets or exceeds ANSI/BIFMA safety standards. Dimensions: Seat Size: 19.5"W x 19"D. Back Size: 18.5"W x 15.25"H. Seat Height Adjustment: 25.75"- 29.50" or 28.75"-31.50"H. Overall: 43.75" - 47.25"H x 27"W x 29.75"D. Weight: 42 lbs. Limited lifetime warranty from OFM. This chair normally ships in 2-3 business days.