Each books has 4 pages coloring boards,fill the water into the pen and start to draw,the picture color will be presented on the coloring boards,your child will be immersed in the magical world of coloring Cartoon interesting design and the use of simple method,help the baby healthy and happy growth painting. Environmental protection material;when dry, the picture color will disappears, reveal colors when wet,can reusable Educational as well as an entertaining colouring book,which makes it ideal choice for gifting. It is carefully packaged with double spiral metal binding, which makes it last longer Before using, it is recommended to put the head of the pen into the water to soak for 2-3 hours, to prevent drip phenomenon, the pen is twisted off counterclockwise. Two drawing pens without pen cap is to avoid the risk of swallowing After finished using if you leave water in the pen will be turn brown and moldy. Don't use the washing machine, ended up leaving a permanent water line across the mat. Please keep away from the heat. No-mess painting for kids