The shell of the art 40 pages storage book is made of environmentally friendly PP material, which is flexible and odor free. Children can also rest assured to use it. The inner pages are made of PP material, soft material, high transparency, waterproof and wear-resistant, transparent and non-reflective. Vertical openings are easy to extract. Adopt ultrasonic welding process, durable and not easy to fall off. Rounded edges don't hurt your hands. Simple and convenient buckle, firm and tight closure of the package. Shrinkable soft rubber handle, easy to carry, comfortable atmosphere.