What it is: A self-propelling, self-sharpening, brow-defying, water-resistant styler. What it does: Featuring a spoolie on one end for precise grooming, this eyebrow styler delivers extreme color precision in one dynamic microfine tip that emulates fine hair-like strokes on brows. It confidently adds what you need, whether it's to shape, color and/or add density. Like a pen, it creates its own just-right point for striking arches. It's long-wearing for up to 12 hours and is resistant to sweat and humidity. How to use: Apply using small, quick strokes to fill in and shape for a perfectly defined, natural look. The microfine tip mimics the look of natural hair. : Featuring a spoolie on one end for precise grooming, this eyebrow styler delivers extreme color precision in one dynamic microfine tip that emulates fine hair-like strokes on brows. It confidently adds what you need, whether it's to shape, color and/or add density. Like a pen, it creates its own just-right point for striking arches. It's long-wearing for up to 12 hours and is resistant to sweat and humidity. A self-propelling, self-sharpening, brow-defying, water-resistant styler. Mac Eyebrow Style - Strut.