So Konwet, the latest ink brush in the store is a runny ink brush with an edge that bleeds as if you are drawing on a wet paper towel. A variable sized allows you to do fairly detailed work at low pressure but the brush really excels at broad gestural drawing.
(sorry this offer has expired)
Drawing with the ‘So Konwet’ responsive Photoshop ink brush for digital artists
This brush is included in the Art Brushes Complete set