The 432 Hz version of the Crystal Singing Bowl 10" Frosted is tuned to the note E, but the concert pitch A is not on the western standard frequency of 440 Hz, but at 432 Hz. This tuning is said to have a particularly relaxing and calming effect. However, this singing bowl does not harmonize with conventionally tuned instruments. It should be played either individually or together with other 432 Hz instruments - such as Sela Unity Handpans.