A kabuki brush (sometimes called mushroom brush) is a makeup brush with a short stem and dense bristles. The brush head is most often rounded, though it can also be flat. Traditionally, the bristles are made of natural materials like animal hair (e.g., goat or horse hair), but most brushes available now on the market have synthetic bristles.
Video Kabuki brush
Origin
It is named after the Kabuki Japanese drama theater where actors wear Kesh?, a very heavy makeup that emphasizes the nature of their characters. There, the kabuki brush is used to apply the white powder rice uniformly on the entire face.
Maps Kabuki brush
Modern usage
Usually, a kabuki brush is used to apply loose powdered make-up on large surfaces of the face (e.g., foundation, face powder, blush). Because of its design, the brush blends powdered make up evenly on the skin and creates a very natural looking coverage.
References
Source of article : Wikipedia