For children ages 3 and up; Watercolor book size: 7.48 x 6.10 inches; Magic pen size: 4.92 inches. Each book contains 4 coloring plates, fill water in the pen and start drawing, the color of the image will be displayed on the coloring plates, your child will immerse themselves in the magical world of coloring! Interesting cartoon design and using simple method, helps baby grow healthy and happy. Environmental protection materials; When dry, the image will fade, revealing colors when wet, and can be reused. Note: Before use, it is recommended to put the pen head in water to soak for 2-3 hours, to prevent drip phenomenon, the pen is twisted counterclockwise. Two drawing pens without pen cap to avoid risk of swallowing. After you are done using, if you leave water in the pen it will turn brown and moldy. Do not use a washing machine, as this will end up leaving a permanent water line through the carpet. Please keep away from heat. A board without messages for children! This exciting coloring book includes four reusable pages and a refillable water pen. Simply use the pen to color in each scene – details and vibrant colors appear with every stroke! Then let the page dry to erase the images and fill them in again and again