Explore our 11 inch frosted crystal singing bowls. In a 11 inch bowl, you can start getting the 3rd octave lower tones in the notes A, A# and B. The A and A# can still play 4th octave, though are many times 3rd octave bowls. F and F# are the main notes sold in the 11 inch size. At this size you will start getting a slightly longer sustain than smaller bowls.