Brush pens offer much more variation in line width than a fineliner pen. Their nibs have a broad foundation that then tapers to your fine level. Normally the nib is crafted from a conical piece of felt, but you can find pens that have a real brush suggestion crafted from https://inkdrawingforbeginners89025.blogvivi.com/37427409/rumored-buzz-on-how-to-draw-with-ink-pens