A506-04 brush cat’s tongue brush, medium size, thick bristles. the brush 04 by purobio cosmetics has short and thick bristles which allow you to apply cream products in a precise and professional way. ideal for the application of concealers or eyeshadows, particularly the shimmer finish products. how to use after use: after use: clean properly the brush with a mild detergent. for fluid products put a small quantity of product on the back of your hand to avoid waste and excess, dip the brush and apply.