... cardboard, grey back cardboard, glossy or matte art paper, gray board, etc. per your requirements.Paper weight:For cover: 300gsm, 350gsm ... ink, water-colored ink.Accessories:Magnet, ribbon, EVA foam, plastic tray, sponge, PVC/PET/PP window, discs, small toys like crayons, markers ... per your book specifications. MOQ:500pcs for each style book printing . Professional Book Printing Service