... down for package, The 2011 hottest medium back swivel chair 70B Nobody knows where is ... to protect the chair5,Inside materialsa) model plywood , back and seat are seperately two partsb)density foam , ... acceptable, provide certificate. 6,Color: black and orange , color changeable 7,Surface material,the ... + pvc : the front parts(back and seat) are made from pu and back and underside are made from pvc.b). ...