One single resonant tone. Tuned to the frequency of Earth using the calculations of Hans Cousto. The Meinl Planetary Tuned Energy Chime is tuned to precisely deliver a C7# note at a frequency of 217760 Hz. According to Hans Cousto this is the frequency which matches the celestial body known as Earth. The Meinl Energy Chime includes a wooden beater and is designed for therapeutic use.