... 50 micron thickness, unit sheet size: A4 size, 20 sheets/box, preselected tear-line, rolling package, portable ... special automatic clinging film, having a function of store up static for a long time, cling on any ... up to the EN71-1/-2/-3 standard, a substitute product of traditional whiteboard writing product. The ... with whitebaord marker and dry-erased. It's a good assistant of office work and I belive ...