Even the thinnest eyebrows become instantly thick, full, and natural-looking with the Toppik Brow Building Fibers Set. Compared to eyebrow pencils or gels, eyebrow building fibers appear more natural and last longer than eyebrow powder. The best eyebrow makeup for full, natural-looking brows is this three-piece set, which comes with brow wax for shaping eyebrows, brow building fibers, and a special dual-end brush for applying the wax and fibers. What it does: This three-piece eyebrow kit teaches you how to properly shape your eyebrows. Three essential elements make the revolutionary Toppik Brow Building Fibers set special. Your natural brow shape is defined and set by brow conditioning wax. Brow building fibers stick to brows, fill in areas that are patchy, and give brows a durable color and thickness.