Using the calculations of Hans Cousto (The Cosmic Octave) to match the frequencies of the sun, moon, and planets, each gong is tuned to produce the corresponding frequency. These gongs are handcrafted by the gong makers to respond with great sensitivity in all playing applications. Their mysterious sound comes from the countless hours spent handworking the metal. It is atmospheric and soothing.  Therapeutical effects the planetary frequencies can cause (Mercury 141.27): Supports ability to understand and grasp the world through intellect, mind and spirit. The original principle can open up the world again and again Features Handcrafted masterpiece Made in Germany Nickelsilver Exact fine tuning through hand-hammering Printed logo and tuning info 141.27 Hz / C2#, A4/a' 440 Hz ? 448.50 Hz 32 diameter Includes cover and gloves Nickelsilve material Watch: Meinl Sonic Energy - 32 Mercury Gong; 141.27 Hz / C2# - G32-ME