The Black Rouge Power Proof Pen Liner is a liquid pen eyeliner that is waterproof & very long lasting. The ultra sharp tip is a velvet tip pen which allows for precision & even application of the colour. The formula is a smooth liquid that is very opaque dark & semi-matte. Perfect for everyday eyeliner or more dramatic wings. Black Rouge has used polymers to help this eyeliner stay all day through oil & tears. It is important to store this liner horizontally so the tip can naturally re-saturate but not overfill.