4DAmplifier brush combines 2 brushes in 1 to deliver volume, length, lift and definition for extreme lashes. Saturates lashes from root-to-tip for the most volume in a single stroke. Perfectly coats the bottom lashes without smudging onto the lower lashline. Tapered end reaches even the smallest lashes in the corners of the eyes. Smooth, buildable, ultra-black formula creates dramatic but weightless lashes that don't smudge or flake. Vegan and cruelty-free. Clinical Test Results: 400%25 more.