Donati Mechanism. Body Weight Tension Control. Class 4 Gas Cylinder. Adjustable Lumbar Back. Multi Position Tilt Lock. Lumbar Support. Seat Slider (Depth Adjustable). Gray Mesh Back. Product Dimensions: Overall Width: 26.18Ó / Overall Depth: 15.55 - 18.7Ó/ Overall Height: 16.54 - 20.47/ Weight Capacity (LBS): 275