This eyeliner pen boasts a brush of only 0.00876mm, the most precise brush available in the cosmetics industry! This allows it to provide the thinnest, most exact line possible, allowing for unparalleled versatility. blinc ultrathin water-proof liquid eyeliner cannot fade, smudge or run, even if you cry or rub your eyes and only when you are ready, the eyeliner can easily be removed with a swipe of gentle makeup remover.