The Therapeutic Series of Zen Singing Bowls was made specifically for Sound Healing Massage, with the bowl either on or off the body transmitting vibrations. The Therapeutic Series has been developed to use on and around a massage table on patients. Smaller bowls may be placed on joints. Medium size bowls to be placed on the body. Larger bowls to be used from the floor or around the body for their vibration. If you are looking for a metal singing bowl to place on a patient and play, the ZT900 or ZT1250 is a great bowl to use. They are thicker on the bottom, to direct vibration downward.