Kuretake water brush pen has been developed to enjoy the feel to Watercolor for everyone. The wait to use is simple. First, you put water in the parts of body. Next, you set the parts and push it to give water. By doing so, water put out bleeding to the brush tip and you can draw. Also, bucket is not necessary to utilize water, you can carry it on the go and use it anywhere. Furthermore, you need not to wash after use. If you shed cloth or sponge to brush tip and put water, you can remove the color attached to the brush tip. Size variation is abundant : fine, medium, large and flat brushes are all available. This water brush pen has unique structure and it is 2 way Type : when the parts of the pike equipped, it becomes flat Type brush pen, the width of the pike is 11mm and the length is 13mm. When the parts removed, it becomes extra large Type brush pen, the length of the pike is 26mm.