This is another brush made to simulate real media, Used thin and it can be used for outlining or lineart with some blur at the edges. Used larger and it can be used for thicker lines or for coloring. Also good for textured, blurred backgrounds.

Some examples:

This brush will sometimes widen out at the edges as if it bled a little and soaked into the paper.

I used a mouse for the first group and then a tablet for the rest.