What it is: A brush that applies color to your brow.What it does: Its stiffer bristles make it easy to define or fill in brows while its precise angle tip provides professional-quality application. It can be used to apply powder, liquid or cream products. M·A·C professional brushes are hand-sculpted and assembled using the finest quality materials. The 100% synthetic brushes incorporate the latest innovations in fiber technology for superior performance and improved longevity.