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 Whole set Perfect pitch 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 two carrying bags two rubber mallet 7 Pcs rubber O-ring 6+8+10+12inch set bowl Perfect pitch 440Hz crystal singing bowl is tuned based on 440Hz, the package include: 6inch B note Crown Chakra with soft case 8inch G note Throat Chakra with soft case 10inch E note Solar Plexus Chakra with soft case 12inch C note Root Chakra with soft case one carrying bags one rubber mallet 4 Pcs rubber O-ring 7+9+11inch set bowl Perfect pitch 440Hz crystal singing bowl is tuned based on 440Hz, the package include: 7inch A note 3RD eye Chakra with soft case 9inch F note Heart Chakra with soft case 11inch D note Sacral Chakra with soft case one carrying bags one rubber mallet 3 Pcs rubber O-ring The Perfect pitch Colored 432Hz 6-12inch crystal singing bowl is tuned based on 432Hz, the package include: 6inch B note Crown Chakra violet color with soft case 7inch A note 3RD eye Chakra indigo color with soft case 8inch G note Throat Chakra blue color with soft case 9inch F note Heart Chakra green color with soft case 10inch E note Solar Plexus Chakra yellow color with soft case 11inch D note Sacral Chakra orange color with soft case 12inch C note Root Chakra red color with soft case One carrying bag two rubber mallets 7 Pcs rubber O-ring