0.09mm high-quality ultra-thin transparent tape. High adhesive tape to keep the double eyelid while resisting water or sweat all day long   What is a different between Extra type and Mild type?  It is a difference of hardness of the adhesive. Extra type's adhesive tape is harder than Mild type. (Recommend for who likes dramatic and clearly looks.) Mild type's adhesive tape is flexible than Hard type. (Recommend for who likes natural and soft looks.) However, ingredient of tape is absolutely same and there is no difference of water (or sweat) resistant. Please choose by your preference