Cover hot stamping process: 300g white card mounting is 600g The material of the cover pressure relief accessory is PVC+sponge The back cover is a white card weighing 300 grams and mounted on a frame weighing 600 grams 68 pages of white double-sided adhesive paper weighing 70 grams Horizontal line Coil material. Colored metal double coil The entire book, including the cover and back cover, consists of 70 sheets