Yasutomo Niji Waterbrush Pen is a brush and water container in one. Easy to use, portable, convenient, and no more spills. Use it anywhere. Great for watercolor, rubber stamping, sketching, and more. Hi quality brush with reservoir handle. Metered flow for good control. Set: Medium/Large Felt Tip 3pc- These pens have a great design, with an easy squeeze handle, soft durable bristles and cap. The nylon bristle tip will give a sensitive response for delicate lines or pools of water. Translucent barrel allows you to monitor water supply. Includes 2/5 in,, 1/2 in. and 3/5 in. brushes. Great for solid colors or powdered pigment, use it with watercolor crayons, markers, pencils, and more, to spread and smooth colors.