Introducing the Suzuki Tonechimes 3rd octave expansion setThis is a smaller, expansion set of hand chimes which has been created to work in addition to the HB-250 set of 25 chimes.The HB-250 is the core set of 25 notes which encompass G35 - G59. The HB-12A expands this set at the bottom, C4-F#4 and at the top G#6-C6. It is important to remember that this HB-12A set is designed to compliment the HB-250 and is not necessarily something to purchase as a standalone product.As with all Suzuki Tonechimes, quality is superb with a bell like tonal resonance and a lightweight construction. They are also supplied in a solid protective hard case.Suzuki tonechime rangesThe above figure shows the range of the tone chime displayed in staff notation. The "8va" symbol above the clef in this image is omitted in the tone chime sheet music. In addition, the symbol is omitted in the display of the staff ntoation written on the main body of teh tone chime.More useful informationTonechime manual