This crystal singing bowl is made with 99.99% quartz crystal, used in music appreciation.Quartz crystal vibrations sound energy comes from pure quartz, crystal sound healing and chakras meditation is also base upon purity quartz energy. How To Play: The operator maintains a calm mood, divides the bowl mouth into three equal parts, taps at these three points, or taps 6 times with the method of drawing a large satellite, and rubs the part of the bowl wall close to the bowl mouth clockwise or counterclockwise. Replenish energy clockwise, release energy counterclockwise, When using multiple bowls, please keep 2-30cm to prevent resonance from causing the sound to become dumb.