This lovely set includes 4 crystal singing bowls (for Root, Solar, Throat and Crown Chakras) and ranges in bowl size (6", 8", 10" and 12"). 
The related notes and details are:
Root Chakra – 12" bowl, C note
Solar Plexus Chakra – 10" bowl, E note
Throat Chakra – 8" bowl, G note
Crown Chakra – 6" bowl, B note 
For easy identification, each bowl has the chakra symbol printed inside
What's included:
Set of 4 white crystal singing bowls 
4 white o-rings (for the bowls to sit on)
2 mallets (one rubber, one suede)
This listing includes a purple bag and set of chakra cards.