Royal Langnickle Aqua Flow Brush is a specialty brush that is a combination of a brush and a water container in one. Squeeze or fill the water reservoir, screw on the brush tip and paint. This brush is perect for travel or outdoor painting. Great for watercolor and more. great low 3-pack price. small, medium, or large synthetic Taklon brush heads that are easy to clean, and great for use on most any surface.