Ergo Air High Back Office Task Chair Fully ergonomic high-back design with square back support and black base as standard. Features stitched fabric seat, 3-lever mechanism with seat slider, and ratchet back adjustment. Standard seat size 520–520mm with gas lift height range 520–660mm. Customise to suit your needs: choose height-adjustable or fixed arms, adjust gas lift height range, select small or large seat size, and upgrade to chrome base if preferred. AFRDI rated level 6 for durability and safety. Delivery options: Fully assembled with rubbish removal, or flat-packed for self-assembly.