... , 240g/M2 4) PU foam,28kg/M3,T/4cm Bentwood office chair, color: blue and black, KD;Material:Armrest: layer glued, beech surface ... and birch core;Seat/back frame: plywood, birch veneer;Fabric: T/ ... : first order/60days, repeat orders/45days, Bentwood birch KD nature office chair