These are definitely neat water coloring brushes. Be aware, in case it wasn't obvious, that paint colors do not come with the brushes. You'll need to use your own water-soluable paints for using these.
In case it isn't obvious, the pens themselves are hollow on the inside. You fill up the pens with the water temperature of your choice. Then you put the brush in the paint color and press a button to release some of the water into the paint and bravo! You now have a color!
I've found that they're reduced the amount of water mess that I usually have after using water-soluable paints. Since all of the water is contained in the brush, it means a whole lot less water all over my surfaces.
The different brush thickness and designs will help pick out the brush type you want. If you put the brushes back in the original case after you're done, the plastic sleeve has a brush guide that shows examples of the different brushes to make it easy to select the one you need.
Pretty good brush! Makes watercoloring a bit cleaner!