The fanciful fish design means that Bubbles is less intimidating, and more fun, for younger users. The front-load design of Bubbles The Fish II optimizes delivery by directing aerosol towards the patient's mouth; and the character design -- with a soft, flexible materials and soft edges -- makes treatment comfortable and fun without pinching or irritation. Bubbles includes a wide elastic band with interlocking tabs to provide your child with a perfect fit. Pari Reusable Nebulizers have been used in a wide range of clinical trials -- from AstraZeneca, Dey, Genentech, Novartis and Sunovion -- to prove safety and efficacy. Cleaning Information: Wash with warm water and liquid dish soap. Rinse thoroughly and allow to dry on a clean, lint-free cloth. Do not place mask in dishwasher or autoclave. For full usage, care and cleaning information review the instructions that come with your mask. Usage Information: This product is the mask only, it does not include the nebulizer.