Niji Waterbrush - Flat 12mm Wide x 15mm Long - 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!