... time 4. eco-friendly paper & ink Fancy music book for baby:Board book printingPaper 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 ... , 157gsm art paper & 1.5mm, 2mm, 2.5mm, 3mm gray board.For text: 300gsm, 350gsm, 400gsm white or gray back cardboard back ...