A lip brush is a small, narrow brush specifically designed for precise and controlled application of lip products, such as lipsticks, lip stains, and lip glosses. The Revlon Lip Brush typically features a thin and tapered bristle head, allowing for precise and even application of lip color. The brush bristles are often synthetic, which helps with smooth and precise application, as well as easy cleaning. Using a lip brush can have several benefits, including: Precision: The narrow and tapered shape of the brush allows for precise application, helping you achieve a well-defined lip line and shape.