Grey board: both sides grey/gray Packing: In reel or sheet as ... , 300, 350, 400, 450, 500 or as you request Grey board: both sides grey/grayPacking: In roll or sheet as requiredGSM ... is used for packaging and printing, such as wrapper of book and stationery, jigsaw puzzle, file folder, cake box, tea box ... box, desk calendar, album, case and bag, leather appliance. grey board