These are highly concentrated, targeted treatment serums (30 mL / 1.01 fl. oz. each) that share a core ingredient: Madagascar Centella Asiatica Extract to soothe the skin barrier. Interestingly, this specific line features micro-sized spicules (hydrolyzed sea sponge particles), which act like microscopic needles to create temporary pathways in the stratum corneum, allowing the heavy-hitting active ingredients to penetrate deeper and absorb more effectively than traditional serums/topicals.