The material is high pure quartz crystal, the purity is more than 99.99%. Item Include: 7 PCS high quality quartz crystal singing bowls (15-30 cm 12"C 11"D 10"E 9"F 8"G 7"A 6"B), 2 PCS carry case bags, 2 PCS rubber mallets, 2 PCS suede mallets and 7 PCS rubber O-rings.
