... ASTM 4.Offer OEM/ODM service chalk and dry erase board.writing board,chalkboard,blackboard,dry eraser board,white board,wooden easal Chalk & Marker BlackboardMaterial: bass ... is chalkboard , the other side is white board, write on it by white board marker. Children can put magnetic blocks on ... both board andThere is a tray between two blackboards,kids can ...