The #150 Precision Blush Brush can be used for blushing, contouring, and even blending on liquid, cream, and powder foundation. It's dense, although a bit small for base application. It'll just take a bit of time to cover your whole face but it will work. The #228 Precision Shader Brush is meant to apply eyeshadow washes, but it can also work with concealers. It's the traditional shape and size for it. The #216 Precision Eye Blender Brush is for placing and blending eyeshadow on the crease as well as for contouring the nose. the #172 Precision Corrector Brush is an odd little number. It can be used for lining the eyes and shading eyebrows, and for applying and blending concealer too.