Detailed Product Description ZY-804ABack outer shell, in black, PP ZY-804BBack inner pad, in black, PPZY-703-1CSeat shell,in black, PPZY-703DSeat plywoodZY-804MechanismZY-030Armrest ZY-PP300Blcak PP Chair baseexports CasterBack bar cover(ZY-804)dust proof coverGas spring( 100 grade 3 )