Features: Synchron-Dynamic Mechanism with Seat Slider and Gas Lift  Schronised Back Rest & Seat Pan Tilt Adjustable Lumbar Support BIFMA Tested - Greenguard Approved 130 KG Weight Rating  Black 5 Star Base On Castors Black Mesh Back Rest  Light Grey Seat Pan Dimensions: Seat Width - 480mm Seat Depth - 470mm Back Height - 505mm Gas Height - 450-540mm