Great diffuser for curly or wavy hair, and the deep cup shape is especially great for long hair. Fits most hair dryers that have a round nozzle - the silicone at the top helps for a snug fit. You can twist the brown base to adjust the airflow (see pictures 5 & 6; the silver peeking through covers and uncovers the holes for more or less air flow). Used only a few times. No signs of wear, damage, or cracks. I’m wearing my hair shorter now and just don’t have a use for it.