Kidsplay Boomwhackers 20 Note Handbell SetA 1. 5 octave chromatic scale from Low A to High E, to play a wide variety of musical selections! The combination of the RB107 and RB107C creates a full chromatic octave of the combination hand deskbells, then add the RB107EX and you have the necessary note before and after the octave to play a wide range of songs. Played by pushing the button or by traditional hand bell technique. Best choice for young kids, special needs groups or seniors with