Natural Golden Silk: MC JABRIAL Vitalize Sericin Concentrate Silky Facial Face Mask Sheet was made from 100% Thai natural gold silk fiber sheet, which contains 18 types of protein that are similar to the ones on human skin. Our natural golden silk fibers also contain the protein sericin. It has properties as a moisturizer that can make your skin 300 times more hydrated. Sericin protein that is coated on the outside of the silk fibers will help shed old skin cells and reduce dark spots, blemishes, and freckles on your face. Our Silky Facial Face Mask Sheet is also biodegradable, making it environmentally friendly.