High-quality BEVCO Anti-Static Ergonomic Stools combine static control and ergonomic features for excellent ESD protection and all-day comfort. Chair averages 1.0x10(5) ohms resistance from any part of the chair to the ground, exceeding NFPA standards. Brass drag chain ensures conductivity. Comfortable 3" thick seat has a supportive waterfall front, while the 4" thick back is contoured for extra support. Pneumatic seat height adjustment. Back manually adjusts both vertically and horizontally. Also includes 20" dia. ESD chrome footring. 12-year warranty, lifetime on pneumatic cylinder. Meets or exceeds ANSI/BIFMA standards. Made in USA.