This is a brush i use to create border in all my comics! I also sometimes use it for text bubbles.
It creates a slightly wavy line that look like it was drawn manually :D
I always use A4 page format, and the size of my brush is always 40!
It couples well with a lineart drawn in THIS BRUSH (https://assets.clip-studio.com/en-us/detail?id=1990141) size 15
![](http://assets.clip-studio.com/en-us/description/2072610/img/bdef0730db-1549-6aa0-98b5-acd33e7fd2.png)
![](http://assets.clip-studio.com/en-us/description/2072610/img/57d53ff9e5-8f4c-1f9d-1785-a994e1e365.png)