Custom watercolor brushes were designed last year during the launch of the Create in WaterColor Paint by Number Kits, but I never officially released them. These were designed to be different than typical watercolor brushes, as we do not paint like typical artists of the same medium.
Available in size 2, 4 and 6 to allow the utmost detail in small to larger openings and to give you the ability to maintain water control, these may also work beautifully for acrylic artists who enjoy the Flow Technique for their paint by numbers. {I have not tried them with this method yet, but they seem to be exactly what we need for that technique!}