... art paper, gray board, etc. per your requirements.Paper weight:For cover: 300gsm, 350gsm, 400gsm white or gray back cardboard back ... art paper & 1.5mm, 2mm, 2.5mm, 3mm gray board.For text: 300gsm, 350gsm, 400gsm white or gray back cardboard back ... , pencils, and so on.Packing details:Double Wall Corrugated Carton for Exporting and craft paper wrapped inside, size per your book specifications ...