... cardboard, grey back cardboard, glossy or matte art paper, gray board, etc. per your requirements.Paper weight:For cover: ... 300gsm, 350gsm, 400gsm white or gray back cardboard back up or more layers mounted per your ... art paper & 1.5mm, 2mm, 2.5mm, 3mm gray board.For text: 300gsm, 350gsm, 400gsm white or ... specifications. MOQ:500pcs for each style children's books . Handwriting Book