childrens coloring book 1.Eco-friendly paper material 2.full color printing with glossy lamination 3.sprial binding method sprial binding childrens coloring book1) Size: customized size.2)Color: CMYK or PMS, full color or patone color( 4C/4C, 5C/5C, 6C/6C)3) Optional Material: white paperboard, white cardboard, copper plate, C1S/C2S art paper, kraft paper, silver and gold paper or other special ...