All-in-one brow tool Bobbi Brown Dual-Ended Eyebrow Definer & Groomer Brush - 6.693" x 0.319" Using the definer end, start at the head of the brow and apply powder or gel with short, even strokes in an upward, outward motion toward the arch. At the tail, flip to the narrow edge of the brush for more precise application. Then lightly comb through brows with the spoolie to blend out color. An all-in-one tool for defining, filling in, and shaping brows. An angled brush head with firm bristles helps evenly distribute brow powders and gels, while the spoolie combs hairs into place and blends out color. Definer side features angled edge and stiff bristles designed for precise, even application of brow formulas.Grooming spoolie smooths hairs into place and blends color for a natural, fuller-looking brow.