no fizz [SEP] these were a disappointment my year old is very into bath bombs right now and we have been buying a variety of types and this has so far been the worse ones they take forever to fizz obviously my year old has the patience of a year old so after minutes of the slowest fizz on earth he took to slamming it on the tub to try and crack the toy out they also do not smell great if you are into super slow non exciting bath bombs get these otherwise i would keep looking we will most likely go back to others we have tried