I have oily skin and am concerned about pore care. I purchased this because it was advertised as a pore cleansing system that creates cleaner, more refined skin using a charcoal mascara with excellent adsorption and adhesion, and bubbles that remove sebum and impurities. I felt a bit hesitant at first because the sheet is black, but since it is black, the bubbles forming are clearly visible, and I realized that is why they made the sheet black. Once you remove the film and apply it to your face, you start to feel a bubbly sensation as air bubbles gradually form. Aside from it taking longer than other masks, it is manageable.