Explore our 9 inch frosted crystal singing bowls. You can find all of the crystal bowls notes in a 9 inch bowl, in the 4th octave. Sometimes the C note will be a 5th octave note, but many times a 4th octave. So in theory you could get a whole chakra set of 9 inch bowls. The main notes purchased in the 9 inch size are the 4th octave A and A#.