Office task chair mesh back

Office task chair mesh backstaffs in office; A. Product Construction description:1. Back: Mesh - Nylon outside frame;2.steel bracket support connecting back and seat in silver powder coating;3. Arm: fix armrest pole in PP armpad;4. Seat: High density foam and PU or fabric upholstery;5. Mechanism: synchronize one vertical lock mechaism, one handle forheight adjustable&lock & unlock6. 85mm height adjustable gasspring for seat height up and down;7. 350mmRadiusNylon baseand 2" PU castors;8. chair dia. below:Model# 1306AChair Dia.:Height:92.5/104.5cmSeat Width:48cmSeat Depth:44cmSeat Height:46-58cmPacking Box Size:63*35.5*59, 1pc/box- knock down packingLoadability:216pcs/20', 490pcs/40'HQ B. This series is cheaper than 900series;C. Our factory approved ISO9000;D. The chair has2 years warrantee.