It is a mask sheet developed by microbial fermentation science. Bio-Cellulose technology was originally used by doctors to heal burns and wounds. Microbial Cellulose is inoculated with a strain in fruit juice which is a natural material made by cultivation and fermentation.It contains an organic compound which is the most abundant in the natural world. It is also called Fibrin, which accounts for more than 30% of all plant materials. It is a new material that can be applied to food, medicine, cosmetics, paper, industrial products, and textile.The Bio-Cellulose mask also efficiently removes excess sebum. Vegan | Natural | Gluten-Free |Cruelty-free 6 Gel Masks Assorted - Bio Cellulose Gel Sheet Mask – Collagen, EGF, Hyaluronic Acid, Peptide, Retinol, Vitamin C (6pcs in total) How To Use - After cleansing and toning your skin, remove the mask from protective films on both sides. Leave the mask on your face for 20 minutes. After removing the sheet mask, apply a thin layer of moisturizer or night cream to retain the nutrients for a longer period of time. Because of the high-concentrated essence contained in the sheet mask, the skin will feel like getting a facial massage. No need to rinse.How To Use - After cleansing and toning your skin, remove the mask from protective films on both sides. Leave the mask on your face for 20 minutes. After removing the sheet mask, apply a thin layer of moisturizer or night cream to retain the nutrients for a longer period of time. Because of the high-concentrated essence contained in the sheet mask, the skin will feel like getting a facial massage. No need to rinse. 6 Gel Masks Assorted - Bio Cellulose Gel Sheet Mask – Collagen, EGF, Hyaluronic Acid, Peptide, Retinol, Vitamin C (6pcs in total). Vegan, Natural, Gluten-Free, Cruelty-free. It is also called Fibrin, which accounts for more than 30% of all plant materials. It is a new material that can be applied to food, medicine, cosmetics, paper, industrial products, and textile. The Bio-Cellulose mask also efficiently removes excess sebum. It is a mask sheet developed by microbial fermentation science. Bio-Cellulose technology was originally used by doctors to heal burns and wounds. Microbial Cellulose is inoculated with a strain in fruit juice which is a natural material made by cultivation and fermentation. It contains an organic compound which is the most abundant in the natural world.