1.aluminum frame 2. melamine board, 3.non magnetic Aluminum Frame melamine Board→Aluminum Frame.→To write with dry markers.→Supplied with aluminum tray and wall holders.→Surface:melamine board,3mm,5mm for choise→Measures:30*45cm,45*60cm,60*90cm,90*120cm,90*150cm,90*180cm.Special size as per customers require.