Planetary tuned tuning fork from Sonic Energy series that is made using the calculations of Hans Cousto (The Cosmic Octave) to match the frequency of platonic year and is tuned to produce the corresponding frequency of 172.06 Hz/F3 within the A4 range of 440 Hz-433.56 Hz. It has been designed for use in therapeutic applications. The tuning fork is handcrafted in Germany from premium stainless steel and features an ergonomic shaped corked handle. Size: 7.4"/188 mm. Weight: 80 g.