Due to its multi-dimensional tapered design, this brush provides extremely smooth, streak-free application. Its wide, densely packed base of firm fibers lays down foundation and builds coverage. The softly rounded, narrow tip perfectly enables detail work. Each fiber is tapered by hand to measure between .05 to .07 mm, enabling every fiber to come into contact with your skin during application. The effect? It repeatedly smoothes foundation and concealer just like water smoothing a stone.