1,iron magnetic blackboard,can be written with chalk. 2,plastic frame and corner. 3,backside is whiteboard. magnetic ... office memo board , blackboard learning system1) Material: tole and plastic frame. Certification EN71 and ASTM passed.2) Size: 20 ... white side and black side. You can write with chalk on the black side and water pen on ... in office and school. iron magnetic blackboard with plastic frame