2-in-1 Lash Boosting Eyeliner + Serum Precious Precision Brush-Tip Hypoallergenic Fragrance-Free Paraben-Free Gluten-Free Cruelty-Free Dermatologist Tested Clinically-Tested Oil-Free Ultra Fine Liquid Eyeliner High-tech formula enhances the appearance of lashes while providing the definition of liquid eyeliner. Lash boosting complex applied at the base of lashes is most effective in improving lash appearance.