The Toppik Brow Building Fibers Set makes even the thinnest eyebrows instantly thick, full and natural-looking. Whether you want to fill in patchy areas or really make your eyebrows pop, the Toppik Brow Building Fibers Set is the best eyebrow makeup for full, natural brows. The 3-piece kit includes a brow wax to shape eyebrows, Brow Building Fibers and a custom dual-end brush for wax and fibers application.