... ×22:(w) ×1.2(thk)mm Surface: metal baking finishing board, thickness: 0.3mmInterlayer: double A corrugated paper, thickness: 10mm.Backboard ... : Galvanized metal board, thickness: 0.2mm; Accessory: angle steel hooksMoving system: steel wire rope +pulley +slide rail +counterweight +structure pieceFeature: ... right,it can be used combine with projector Chalk board,Moveable Green Board HBWX series