MAC Stack Micro Mascara in Black is a breakthrough makeup innovation, featuring a continuously buildable and clump-resistant formula designed to stack on infinite layers of dramatic volume and length while maintaining a completely weightless feel. The secret to its precise application is the Superstack Micro Brush, expertly engineered to separate and define every single lash. This unique brush makes it ideal for targeting shorter lashes and meticulously coating the lower lash line without any mess.This long-wearing mascara delivers a smudge-proof, flake-resistant, and 24-hour performance that stays perfectly in place without fading or transferring. Layer after layer, you can confidently build your look from a natural daytime enhancement to a bold, voluminous statement. Ophthalmologist-tested and safe for contact lens wearers, the formula ensures comfort for even the most sensitive eyes. Enlarge your lashes and magnify your eyes with every stack.