VIVA OFFICE Mid Back Fabric Drafting Chair Stool with Long Gas Lift and Chrome Foot Ring Ergonomic mid-back drafting chair with high quality adjustable chrome foot ring and long heavy duty gas lift.Pneumatic height adjustment range from 22.8 to 30.7 inches meets different height requirements Multifunction Triple Paddle Control Mechanism allows back angle adjustment Back angle lock allows the back to lock throughout the angel range for perfect back support Adjustable armrests and tilt tension for ergonomically friendly seat possible Sturdy Nylon base and high quality Nylon casters added to office working flexibility Easy assembly upon arrival. We provide free component-exchange in two years