Magnetic White board(Aliuminum Frame) the second grade quality: Surface thickness:0.165mm Frame thickness:0.8mm 1) background support A. Metal(normal): thickness:0.165mm B. Plastic: thickness:2mm(plastic)+6mm(cardboard) C. Corrugated Cardboard: thickness:8mm 2) SWC0345: spec.:30x45 SWC4506: spec.:45x60 SWC0609: spec.:60x90 SWC0912: spec.:90x120 SWC0915: spec.:90x150 SWC0918: spec.:90x180 SWC1215: spec.:120x150 SWC1218: spec.:120x180 SWC1224: spec.:120x240 SWC1230: spec.:120x300 SWC1236: spec.:120x360 SWC1240: spec.:120x400