Simple Ingredient with Glowing Results. COSRX's Advanced Snail Mucin Power Sheet Masks hold 10 sheet masks that are absolutely soaked in snail essence. "Mucin" from Snail Secretion Filtrate is an EFFECTIVE ingredient that delivers extreme moisture and instantly soothes damaged skin. Place a sheet mask on a clean face, massage to aid absorption of the essence, and peel off to reveal glowing results. *No snails were harmed in the process.