Bevco 9550ME4 Bevco Integra ESD/ISO 7 Cleanroom Vinyl Chair w/Medium Back, Non-Tilt, Polished Aluminum Base, 20" Adj. Flat Chrome ESD Footring, ESD Mushroom Glides, 21.5" - 31.5" Seat Height Adj., 300lb Weight Capacity, 12yr Warranty