Homycasa Black High-Back Mesh Ergonomic Office Computer Desk Executive Chair Seat Size: 19"(W) x 18.5"(D); Backrest Height: 27". Seat Height: 13"-18" adjustable height. Built-In Lumbar Support; Padded mesh seat and back for whole-day comfort. Pneumatic seat-height adjustment; 360-degree swivel; smooth-rolling casters. Upright locking position with adjustable tilt tension control. Load capacity: 330LBS,Tested For:120-150KG(264-330LB).