I have a large variety of bath bombs: Traditional round ones, large novelty insects (Bumble Bee, Dragonfly, Butterfly, Ladybug). Bath bombs fizz and create lots of bubbles in the bathwater. Bath truffles have some fizzing action but also contain butters to help soothe and moisturize thew skin. Bath melts do not fizz. They are composed of butters and oils. Shower Steamers are designed for those who take showers. There is some fizzing and foaming but the purpose is to release the essential oils during the shower: for relaxation, to serve as a wake-up, to stimulate. One is placed in the shower where the water will dissolve it and the scent of essential oils will fill the shower.