BEVCO's Everlast Electrostatic Dissipative (ESD) or Static Control Chair models meet ANSI/ESD STM12.1–2019 standards providing fully grounded peace of mind. The black ESD polyurethane seat and back are static dissipative; anti-bacterial; impervious to water, oil, and most chemicals; puncture resistant and easy to clean. The non-tilt model features a contoured back that is fully adjustable encouraging proper spinal alignment while the convenient handle makes moving the chair effortless. The waterfall seat aids in lower body circulation, improving overall wellness. The pneumatic height adjustment allows you to easily change your seat height from 15.5" - 20.5". This chair comes with a sturdy 25" diameter polished aluminum base with brass drag chain. Model comes standard with ESD mushroom glides. Optional ESD casters can be ordered separately.