The F42 Stobing Fan Brush features short, soft and dense SigmaTech fibers and is designed to flawlessly apply and diffuse powder and cream products down the nose, above the lip and at the center of your forehead. How to use: Use with powder and cream products to strobe. Clean with a brush cleaning glove or mat or wash with mild soap. Rinse with warm water. Brand: Sigma. Style Name: Sigma Beauty F42 Strobing Fan Brush. Style Number: 5235859. Available in stores.