The basics The Toppik Brow Building Fibers Set makes even the thinnest eyebrows instantly thick, full and natural-looking. The benefits Brow Building Fibers last longer than eyebrow powder and look more natural than eyebrow pencils or gels. The uses This 3-piece kit includes a Brow Shaping Wax to shape eyebrows, Brow Building Fibers and a custom dual-end brush for wax and fibers application, making this the best eyebrow makeup for full, natural-looking brows. The bottom line The Toppik Brow Building Fibers Set has 3 key components that make this groundbreaking brow set unique.