1 Pair Butterfly feet renewal treatment mask (without box) Material: Contains milk fermentation extract, lactic acid, protease (a protein digesting enzyme) Thoroughly wash your feet.For people with extremely rough cuticles, you may also exfoliate your feet prior using the masks. Dry your feet. Remove the masks from the pouch and wear them as if you are wearing your socks. Wear the masks for 1-2 hours. You may experience tingling or warming sensation, this indicates that the masks are working.Stop using if you experience uncomfortable burning sensation. Wait for the peeling process to start.