The waterbrush tip size determines how much water is dispensed with each brush stroke. Fine brushes release less water per stroke and are good for detail work while large brushes are suited for covering larger areas.
The Pentel Aquash Water Brush Pens are one of the most versatile tools I've ever come across. It can be used with so many different materials and create a ton of unique and exciting effects. Learn some of the basic techniques in my water brush tutorial!
Favourite Water Brush Lettering YouTube Tutorials for Beginners