Royal & Langnickel Aqua Flow Brushes are convenient, portable watercolor brushes at affordable 3-pack or class pack prices. Just fill the large barrel with water and let the creating begin. The small, medium, or large synthetic Taklon brush heads are easy to clean, and great for use on almost any surface with any waterbased media. Great for classrooms. studios, or for plein air painting, Aqua Flow brushes help minimize water spills.