6 Pcs Copper Tumbler Set is highly preferred because it is durable and it has excellent characteristics. It help to prevent the spread of diseases. Also, it helps to regulate digestion and cardiac orders, the basis of good health, as practiced by Ayurveda and Rishis from old Vedic times. This 6 Pcs Copper Tumbler Set is easy to clean by hand. It is advised to avoid detergent as it can cause oxidation leading to permanent damage.