What It Is: A pencil cartridge refill for Long-Wear Brow Pencil (sold separately). How It Works: Features a multipurpose sword-like shape: the flat edge softly fills in brows while the pointed tip boldly defines them. Comes in extended brow-true shades made to match virtually all hair tones. Easily refills of the Bobbi Brown Long-Wear Brow Pencil. Waterproof and sweat-resistant. How to Use: When you're all out of Long-Wear Brow Pencil (sold separately), simply remove the empty cartridge and insert the refill. 0.01-oz.