Crystal Singing bowls that come in a set of 7 only. Nesting Bowls (stackable) measuring from 7″- 13″ Diameter. Includes 3 bags, 7 rubber rings and 7 suede strikers. Crystal Singing Bowls are useful for yoga, meditation, and/or sound healing sessions. The tones they provide are long lasting and pure. They are typically made out of Pure Quartz-type crystals (Clear Quartz, Rose Quartz, Citrine, Amethyst, etc.). Crystal bowls are lightweight compared to other singing bowls, and produce a clear, long-lasting tone with various vibrant overtones when struck. These bowls are not just aesthetically pleasing, as quartz is famously one of the most healing crystals you can find. The healing properties of that crystal combined with the soothing vibrations produced by our beautiful frosted crystal bowls, combine to become a very powerful tool for healing and transformation. Crystal Bowls may break if you over sing them or strike too hard, due to the vibrations becoming too powerful for the crystal material. Due to its fragile nature, it is always recommended to carry these bowls in a case.