Our Beard Filling Pen Kit Contains Grease, Wax-Based Medium. It can last all day long with confidence, won't smudge or fade due to sweat or rain, giving you a perfect contoured and plump appearance. Its usage method is very simple: first draw the outline lines, then apply color evenly along the shape you want for your beard or mustache. And it's waterproof, sweatproof, and doesn't smudge makeup.