Quartz Crystal Bowl These bowls are made by pulverizing quartz crystal and heating it into shape. A (La) = 432Hz tuned set of 7 bowls. Diameters range from 12 inches (30 cm) to 7 inches (17.5 cm). The musical scale is from C (Do) to B (Si), the seven notes of Do Re Mi Fa So La Si. There are no semitones. The sound energy emitted from these is wonderful. You can experience very powerful energy. The musical scale that resonates with each person differs, and for some, it may awaken past memories or stir emotions. There are various effects. Although new, they have been opened for inspection and photography. Tuned to A4 (La) = 432Hz. Modern instruments are all tuned to A4 = 440Hz, but before 1939, classical music was tuned to 432Hz. Mozart and Vivaldi composed in 432Hz. 432Hz tuning sounds gentler and more beautiful, and has a healing effect. Nowadays, Steiner education uses 432Hz instruments to let children listen to the musical scale. Trial performance videos: Posting URLs and linking externally is prohibited by Mercari guidelines. Search for "Mercari Hello" on a famous video site, you may find reference videos. 432-7-5 is this product. Includes: 2 rubber drumsticks, 2 leather-covered sticks, 7 rubber rings to place the bowls on, 2 carrying bags (holds all 7 bowls) Will be shipped in the original box. Weight is 17 kg including packaging. The weight of the bowls themselves is about 15 kg. Box size: 75 cm x 40 cm x 35 cm When playing the highest note, it's easier to produce sound by rubbing the side of the bowl with a rubber mallet. We will ship with care. Shipping included.