Dr. Mask Pore Tightening Sheet Mask 25ml X 10ea, ROVECTINPRODUCT INFORMATION This pore tightening sheet mask with patented ingredients helps control excess sebum and refine pores. A high concentration of birch tree extract deeply hydrates the skin. Rovectin Dr. Mask Pore's patented Tanin complex helps tighten pores and control sebum; formula for effective pore care. A high concentration of birch tree extract refreshes cleared pores with deep hydration. It's completed a clinical trial for refining pore size.