... price Various book printing servicePaper material:White 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 ... & 1.5mm, 2mm, 2.5mm, 3mm gray board.For text: 300gsm, 350gsm, 400gsm white or gray back cardboard back up or more layers ...