Brand from South Korea: Etude House. The brush is made with 2 different synthetic fibers that deliver a brush with resilient and elastic texture. How to use: 1. Using the Duo Fiber brush, apply highlighter on your forehead, down the center of your nose, the middle of your upper lip, the middle of your chin, your under-eye area, and right above your cheekbones. 2. If your powdered makeup products are leaving flecks behind, a light sweep swipe of the Duo Fiber Brush can easily wipe away the excess too.