Brush for applying makeup and concealer. It is made of fiber.

High-quality, highly soft synthetics caress the skin while spreading makeup or concealer evenly—a building. The designed head allows makeup to be applied gradually, layer upon layer, hiding spots and blemishes. This technique makes the skin look natural and uniform, making it especially suitable. 

This is for applying concealer; the tip is designed to reach the inner corners of the eye and nose.