NWOB Hourglass' travel-sized Caution Extreme Lash Mascara is an all-in-one mascara that delivers endless length, intense volume, and sky-high lift for extreme, dramatic lashes. The 4DAmplifier™ brush features densely packed bristles and a smooth glide formula that work together to saturate lashes from root-to-tip for the most volume in a single stroke. 4DAmplifier™ brush. Smooth, buildable formula. Smudge- and flake-free.​ Vegan. Cruelty-free. Ultra Black.