BMA Axia Focus 24 Hour Control Room Chair simply ergonomic
Flash Furniture Hercules Series 24/7 Intensive Use Big & Tall 500 lb. Rated Mesh Executive Swivel Ergonomic Office Chair with Ratchet Back, Metal, Black, Set of 1 : Amazon.co.uk: Home & Kitchen
Ergonomic Task Chairs: Bromley 24/7 Control Room Chair