It wasn't until the middle of the 20th century that the Western standard of tuning A to 440 Hz began to take hold. Prior to this, the standard in the West was to tune A to 432 Hz. Today, many people are interested in this standard of tuning as an alternative to 440, which has become the dominant way to tune instruments.
If you're interested in exploring the world of 432 Hz, take a look at these bowls and sets selected specifically according to A=432 Hz tuning. You will soon be traveling at 432 cycles per second down the sonic rabbit hole.