The Teknik Office Ergo Plus Headrest Black Fabric Executive Operator chair is one tough cookie. Certified for 24 hour use (BS 5459-2: 2000) and rated up to 24 stone, you won't get a hardier contract chair for call centres, operation hubs and a variety of other office environments. It's available in Blue or Black padded fabric and includes Apex height adjustable arms. 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!