Aqua2go CRETACOLOR Water brushes set comes with 3 water brushes, a fine, a medium and a broad and the name describes it beautifully. These brushes has a barrel that you will fill with water and is very easy to use. Easy steps to use: unscrew – fill the barrel water – start painting. The amount of water you need you can control by squeezing the barrel of the water brush. You can use these brushes for water coloring techniques and tempera, the barrel can also be filled with highly dissolved water colors. The brush tip is protected by a cap.