... usage:ad, boxes,septum Industrial usage board (including wire/cable wrapping, class/steel board wrapping, cushion, rack, clapboard, ... cultural articles and biologic engineering ect.Advertisement decoration: display card, product signage, billboards, light boxes, cabinets, molding ... of the board ( length* width* thickness) (2) GSM ( gram per square meter) which is the most important. PP Hollow Board