The Teknik Office Ergo Plus Headrest Black Leather Look Executive Operator chair is one tough cookie. Certified for 24 hour use (BS 5459-2: 2000) and rated up to 24 stone : you wont get a hardier contract chair for call centres : operation hubs and a variety of other office environments. Its a PU Leather look chair so has the added feature of being wipe clean : it also has optional extras such as arms (fixed or height adjustable) or different forms of five star base (premier aluminium pyramid base : ultra nylon pyramid or plus standard nylon) or you can opt for the non-headrest version of this chair (9600). The possibilities of customising this chair for your customer are many. Other features include an anti-shock function : 2:1 back and seat syncron (5 position) : 4 position seat slide : lumbar and ratchet back height adjustment on backrest and gas lift seat height adjustment. So many features.