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office chair HA middle back Staff or task Office chairoffice; A. Product Construct feature:1. Back: Taiwaness Yidartex - fire resistant, PP outer and inside cover;2. Back : height adjustable;3. Arm: fixed armrest pole and PP armpad;4. Seat: fabric upholstery- synchronize back & seat;5. Mechanism: H018mechaism, height adjustable handle,lock & unlock handle;6. 85mm height adjustable gasspring for seat height up and down;7. 320mmRadiusNylon baseand 2.5" PU castors;8. chair dia. below:Model# 922Chair Dia.:Height:101-111cmSeat Width:49.5cmSeat Depth:49cmSeat Height:45.5-53cmPacking Box Size:72*34*59cm, 1pc/box- knock down packingLoadability:190pcs/20', 470pcs/40'HQ B. This series is cheaper than 900series;C. Our factory approved ISO9000;D. The chair has 3 years warrantee.