Ayurveda recommends a simple, practical and effective method of drinking water in its most holistic way - drinking water from a copper vessel.You can also use your copper vessel to drink water from it at all times. It's recommended to drink the water at room temperature. The copper cups should not be stored in fridge. Copper darkens naturally over a period of time. The copper cup requires cleaning from time to time. Use lemon juice or tamarind to rub the utensils.To make copper water useful and healthy, pour water in the copper vessel and leave it overnight. Drink it as soon as you get up in the morning. This set of four Moscow Mule Mugs will be sure to keep your drinks cold! Each 18 oz mug is 100% solid copper (no nickel lining) and features a brass handle as well as an owl engraved logo on the bottle of each cup. Perfect for cocktails, beer, and even iced tea. The one-of-a-kind uniqueness of these hand-hammered mugs will be sure to impress your guests. Included with your purchase will be an electronic flier containing popular Moscow Mule drinks and care instructions. These mugs are not intended for hot beverages, dishwasher, or microwave use. Instead, wash with warm soapy water and immediately dry with a soft cloth.