Suitable for 3 years old children. The dye of the pen is water, non-toxic, easy to clean. Don’t afraid that the baby or your house would get dirty . After painting with the water pen, the whole color changes immediately, a few minutes later, the color will automatically disappear. It can be used repeatedly, very environmentally friendly. Kids are fascinated as colorful images spring up, then slowly fade away. Textured fabrics and bright colors help to develop children's sensory awareness , colourful photographs and soft pages appealing children while giving them a head start on learning number, shape and colors . Let kids develop an interest From childhood. The clip keeps all of them together and easy to portable, this is perfect art travel toy for indoor and trips, kids can drawing and learning anytime anywhere, provide both entertainment and education, best gift for your baby .