Benefit Mighty Fine Brow Pen 4 - warm deep brown ✨️NEW✨️ BNIB Size 0.01 fl. oz. / 0.5 mL Standard size A triple-tip brow pen that instantly fills in brows and mimics the look of natural brow hair. This is the finest triple-tip brow pen out there. It draws on three superfine lines in one stroke to instantly fill in brows and mimic the look of natural hair for a defined look that lasts 24 hours.