Pure Ratios proudly presents the first and only line of patent pending, 96-hour topical reservoir patches. They are naturally pure and additive free Our Topical Patches are: Hypoallergenic and water-resistant Lab tested Made with all natural ingredients No chemical enhancers or adhesive mixed in with reservoir formula Skin tone patch for discrete use 40mg dosage Round design with no corners to cause patch to peel off Last 3-4 days