This pack contains a vector displacement mesh (VDM) brush with 6 lips for Zbrush. Each pair of lips has both a closed and open mouth variation, so 12 lips in total (see images)

Also included is a short video tutorial on how to load the brush and some tips for using.

Just load in the brush and draw it on your character, as seen at the beginning of this tutorial: https://youtu.be/Ms1vX1qi8Pg

Note: May not work with older versions of Zbrush so please make sure its updated!