All of our Tibetan (Himalayan) singing bowls are old, some over 100 years old. There are several different styles of singing bowls. These are from Orissa and are deeper than the shallower Assam bowls which are more common. This deepness seems to correlate with an especially long sustain and ease of play.
Tibetan singing bowls produce a beautiful, complex tone, full of harmonics and overtones, when struck or rubbed with a stick. Many people find them very helpful for meditation, and some practitioners use them for sound healing.