Repost from last year's inktober. These are my tools. The greys that I use are all from the middle brush, the grey gets darker the more I layer on top of it. I bought an empty pentel brush pen and filled it with ink and water.
Featuring four of the popular Pentel Aquash Water brush Pens in different tip and body sizes, this set has all brushes you need to do watercolor paintings. Extremely portable and convenient to use, these water brushes are a must-have for any artist!