The Kansa bowls are made of an alloy of copper and tin (bronze). 
They are used in Ayurvedic foot massage treatments, known as Pada Abhyanga, to draw out heat from the body and promote relaxation. 
 
Some of the benefits include:
Heat Drawing: Kansa bowls are used in foot massage to draw out heat from the body, providing a refreshing and relaxing experience.
Improved Circulation and Relaxation: The massage can improve blood circulation, relieve tired feet, and promote relaxation.
Better Sleep: Some believe the foot massage can aid in achieving better sleep. 
Detoxification: Some believe Kansa bowls can help detoxify the skin by drawing out impurities and toxins. 
Improved Circulation: Kansa bowls can stimulate blood flow. 
Relieve Stress: Kansa bowls are associated with relieving stress and promoting holistic healing.