This brush has a wide range of uses. Suitable for both details and larger areas. The H2O brush is a great addition for decorating cakes. It has many uses. This brush is universal in size. An essential part of the product is a practical cover for the bristles. You can use it to moisten the cake covering if you want to add small details, such as glitter, snowflakes, or gloss. The brushes can be filled with water and then mixed into the color palette, allowing you to paint with it - just like you would with a regular brush but without the need for additional water. You can also fill a food coloring pen (we can only recommend a different pen for each color). Instructions for use: 1. Unscrew the brush from the reservoir. 2. Dip it in water (or the color of your choice) and press the "push panels." It will fill by loosening. 3. Attach the tip. 4. You can determine how much water or color passes through by gentle pressure on the sides - greater pressure will release more water / color.