MACSTACK ELEVATED BLACK STACK. Benefits: +165% instant lash lift*. Volumizing. 36-hour hold. *Clinical testing on 32 people.. Features: 91% naturally derived formula** featuring argan oil. **Per ISO16128 from plant sources, non-petroleum mineral sources and/or water.. Sweat- and humidity-proof. Fade- and smudge-proof. Flake-resistant. Clump-proof. Key Ingredients: 91% naturally derived formula** featuring argan oil. **Per ISO16128 from plant sources, non-petroleum mineral sources and/or water.