Sansula
The sansula is a patented innovation of the kalimba (also known as sansa, mbira or thumb pianos) which originated in southern Africa. The vibrations of the sansula pass through a wooden block and transmit to a resonating membrane where they are more prolonged than with other means of amplification. The sounds produced are wonderfully mellow and full of overtones.
They are tuned in a specific way and mine is tuned to the a minor scale with a beautiful melancholy feel to it. I do not play a tune as such because this would encourage the mind to interact, respond to it and predict what might come next. Instead, I use a series of note combinations, so your mind is listening but not interacting and therefore, is more inclined to move into a deeper state of consciousness than it would if I played a tune.