What is Feng Shui you ask...Developed in China over 3,000 years ago, Feng Shui is an ancient science and art of luck. The word Feng means wind and Shui means water. Within the Chinese culture these two natural elements, wind and water, are associated with good fortune. Who doesn't need that? The base of these Black Onyx Star of David Feng Shui sets measures 54mm in diameter. Each set has six 12mm Black Onyx balls and one 16mm Black Onyx ball. Black Onyx is a grounding stone with stabilizing frequencies. Black Onyx is said to promote both strength and stamina and good health. What a deal, these were originally $30.00.