Flash Furniture Hercules Mid-Back Multi-Functional Computer Chair, Gray: * Ergonomic swivel chair * Pneumatic seat height adjustment * Independent seat and back tilt * Forward tilt control knob * Tilt lock control mechanism * Infinite position seat and back angle adjustment lever * Built-in lumbar support * Thickly padded and contoured seat and back * Height and width adjustable polyurethane arms * Dual wheel casters * Fabric upholstery * Heavy duty nylon base * 2-year warranty for parts * Overall dimensions: 23"W x 22.5"D x 38.5"-43.25"H * Seat size: 19.5"W x 18"D x 19"-24"H * Back size: 18"W x 21"H * Arm height: 24.75"-32.5"H * Model# BT662GY