Crystal singing bowls are used for Chakra balancing energy healing sound healing yoga crystal cleansing and specially used at the beginning and end of meditation. They are made of pure quartz (essentially 99% silicon quartz) and sand in a process that heats the mixture to about 4000 degrees and artificially shapes it to give it a variation in sound. FMTY Frosted White Crystal Singing Bowls are the best crystal singing bowls for beginners. They have the thickest walls out of any of the bowls so they can hold the most vibration and are also the sturdiest bowls.