Choose the BEVCO Static Control Seating base that best suits your work environment. Ergonomically designed chairs feature advanced static discharge control and self-skinned polyurethane that offers a surface resistance of 10(8) ohms or less. Select one of these bases: heavy-duty polished aluminum 5-star base, 16-ga. chrome-plated tubular steel with 19" welded chrome footring, or heavy-duty polished aluminum 5-legged base with 18" adjustable chrome footring. All chairs feature pneumatic seat height adjustment and adjustable backs with lumbar support. Seats have waterfall fronts to ease pressure on legs. Chairs swivel a full 360°. Drop chain ensures conductivity. 12-year guarantee, lifetime on the cylinder. Meets or exceeds ANSI/BIFMA standards. Made in USA.