Super large ergonomic operator chair Designed to withstand up to 24 hours a day use within normal office environments Rated to BS549 Level "S" 24 stone Ratchet back height adjustment Antishock autosyncron mechanism to seat & back User weight tension control Gas lift seat height adjustment Seat slide function Available with or with out armrests Suitable for up to 24 hours use per day 1 year manufacturers guarantee Delivered flat packed for easy self assembly