Tone Number: 1 weight (kg): 1.9 Material: Quartz crystal >99.99% Musical Note: C Size:8" (8 inch ) Frequency: 528Hz 3,000 to 4,000 degrees high temperature firing. The audio is stable and the sound is mellow. 99.99% natural crystal. Polished by hand, the shape is correct. Application: Sound therapy,yoga, meditation Note: Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures.pls understand Thank you! Please allow 1-3cm measuring deviation due to manual measurement. The best gift for friends.