The crystal singing bowl made form pure quartz,and different size with different Musical Note. Each bowl is crafted to be sturdy and durable. They vary in size from 6" to 28". They also vary in pitch, ranging from high and clear tto deep and soothing. Generally, the larger the bowl, the longer the sound will reverberate and the lower the pitch will be. The Frosted bowls carry an Earth energy. Their white color reminds of purity and new beginnings. The effects of playing Frosted Bowls in the home, office or a large group setting can be more grounding and help promote a stable, peaceful energy. The sound is pure and relaxing, excellent for meditation and healing.