"My frosted crystal singing bowls are made from 99.9 percent pure quartz crystal. Using crystal singing bowls for sounds healing allows us to respond more quickly and favorably to the sound as therapy. My crystal singing bowls feature the classic design, the frosted surface is very responsive to both classic suede mallet and crystal rubber mallet. The Perfect pitch Colored 440Hz 6-12inch crystal singing bowl is tuned based on 440Hz, the package include: 6inch B note Crown Chakra with soft case 7inch A note 3RD eye Chakra with soft case 8inch G note Throat Chakra with soft case 9inch F note Heart Chakra with soft case 10inch E note Solar Plexus Chakra with soft case 11inch D note Sacral Chakra with soft case 12inch C note Root Chakra with soft case One carrying bag A pair of crystal mallet 7 Pcs rubber O-ring"