... -12315*203mmchalk and erasernon-toxicFeatures: 1,basic material of the wood blackboard is MDF board.2,surface black is coated with non ... special machine.3,there is a base to hold the blackboard.4,can be written constantly with a chalk.5,usually ... more than 600 workers, specially producing different kinds of mini blackboard,chalk board, whiteboard, writing & drawing boards and color clay for ...