Billion Dollar Brows Brow Brush applies & blends brow powder to perfection. Two tools in one! The brush’s specially designed bristles allow you to create a clean, soft line that precisely defines your brows. Blend the powder with the attached brush to create a perfectly defined arch. Billion Dollar Brows Brow Brush is comprised of a blend of synthetic & natural fibers, the Brow Brush helps you groom your brows for a flawless finish.