Niji Waterbrush - Medium Round 12mm - Portable, easy-to-use brushes with a reservoir that you fill with water. No more spills! No mess to clean up! Use them anywhere- take them on vacations or out in the field for plein air painting. You lightly squeeze the brush handle to dispense water directly to the brush tip, so you don't have to carry a bottle of water to dip your brush into! This medium brush has a round pointed tip that is 12mm long. With the handle and cap, the overall length is 7-1/8 inches.