Jinzhou Taifeng Quartz Co.,Ltd.founded in 2000. We are a professional factory integrating quartz product processing, production and export. We have many senior engineers hold rich experiences.All of raw material quartz are imported from USA. They made with 99.99% pure quartz crystal. (The color of the real quartz is not pure white). Just feel free to contact us if you would like to other note or size( 6-28 inch ). CDEFGAB note is available. Quartz crystal vibrations sound energy comes from pure quartz, crystal sound healing and chakras meditation is also base upon purity quartz energy. A rich resonant tone exude from these crystal singing bowls by sticking gently or rubbing with the accompanying mallet. These tones move through our body in vibrant waves, calming, aligning and healing our energy centers. Growing medical research is validating the powerful use of these bowls in balancing and healing the human body, mind and spirit. What is more, Be careful when carrying them. It is fragile. And please avoid too close of each other when you playing as their intense vibrations can lead to shattering or breakage.