One Fish, Two Fish, Red Fish, Blue Fish! I do like them on a Mask, I do like them in a Class. Celebrate the joy of learning with this famous Dr. Seuss book on a mask. Mask contains inside pockets to place additional filters. Thin elastic blue bands attached to provide security and comfort. If you like, you can get it with inner facing, which acts as an permanent filter. 100% cotton mask. The decision is yours. Packaged inside of a plastic bag which is sealed immediately after the mask production.