Synthetic fibres for medium-to-full blending of all bare Minerals® Foundations & Concealers. Due to its multi-dimensional tapered design, the bare Minerals® Complexion Perfector Brush provides extremely smooth, streak-free application. Its wide, densely packed base of firm fibers lays down foundation & 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 & concealer just like water smoothing a stone.