Brush by Sigma. The P80 Flat Precision™ features a small, dense and flat brush head for precise concealer application. Made with exclusive Sigmax® fibers, this brush was designed to mimic your fingertips and best used to stipple concealer onto sun spots, blemishes and other small imperfections without any absorption of product. Unique Feature: Small, dense and flat head. Function: Concealer application. Recommended Use: Stipple concealer onto sun spots, blemishes, and other small imperfections.