Polyurethane ESD Tractor Desk Height Stool in Chrome is adjustable from 17-22 inches from the top of the seat to the floor and features electro-static dissipating components to ensure proper grounding with ergonomic adjustments such as seat height and cast-aluminum base with dual-wheel, self-braking, non-marring ESD casters suitable for hard floors in chemical, soil, and puncture resistant polyurethane.