Liquid DefineLIQUID DEFINE Our Liquid Define comes in two shades (black & brown) and is long lasting, smudge proof and highly pigmented Amazingly easy to use, the liquid liner pen draws a gorgeous line on the lid, creating perfect definition. Our Liquid Define is the ultimate long wearing, waterproof liquid liner pen. Unlike other liners, the precision tip pen provides smooth and controlled application every time and easily draws a thin or thick line in one sweep.