Pen pressure brush?
I'm honestly getting quite upset about this. I'd imagine this would be an easy to find setting considering it's used for most digital art. But I could just be an idiot too.
I need a pen pressure brush. Where the brush preview is a line with sharp edges and a thick middle. Something like this.

Can someone tell me how I go about getting this specific brush? Can't find it, and no tutorials on how to do it. I'm so confused. Thanks in advance.
