... to write and wipe off Non-reflective, Moisture-proof, Blackboard Chalk (Writing board, chalk board)Modle No.: CC-1003Dimension: 120X400CM,120X360CM,120X300CM, ... welcome- Various sizes and surface materials are availablePacking:-The Blackboard’s surface will covered the PE Control Film, The ... GB|T28001:2001 Occupational Health and Safety Management System Blackboard Chalk (Writing board, chalk board)