Copper cups have been used in India for over 2,000 years. According to Ayurveda, drinking water from a copper cup promotes the balance of the three energies known as Doshas (Vata, Kapha, and Pitta) that circulate within our body. Copper has antimicrobial, antioxidant, and anti-inflammatory properties and helps neutralize toxins. Copper is also widely used in both in-person and remote energy treatments. It is considered a very important metal for enhancing our ability to express ourselves, accept true feelings, and balance personal qualities and self-assertion. Additionally, copper also acts as a protector against radiation and electromagnetic waves from electronic devices. This copper cup has a capacity of 250 ml. Suitable only for cold or room temperature water. Do not use with hot liquids. Not suitable for milk, citrus, and acidic liquids. This copper cup is made with 99.9% pure copper. Its exterior is polished and lacquered, and its interior is only polished. CLEANING AND CARE Clean with natural detergent, a soft sponge, and water at room temperature. To enhance the shine, use lemon slices or a copper polish a few times a year. Do not expose to direct sunlight. Do not place the cup in the dishwasher. Do not use the cup in the microwave. Note: As a result of oxidation, the color of any copper object may change, and it is natural for copper to have some "stains." Both are results of the natural properties of copper and have no negative effect on the drinking water from a cup like this.