Sela INFINITY Crystal Singing Bowl (Light Purple) - 7"The Sela Infinity Singing Bowls stand out from conventional crystal singing bowls thanks to their low weight and elegant design. Despite their smaller mass, the Infinity Bowls prove to be very vibration friendly and impress with their considerable volume. The Infinity Bowl B3 has a diameter of 7. 0" (approx. 17. 5 cm) and is made of 99. 9% pure quartz crystal. The material used has excellent sound properties thanks to a special manufacturing process