Hammered and lacquered Finish: Copper gets oxidized when getting in contact with air, thus making the copper color to fade. This copper glass is a lacquered finish which prevents oxidizing and fading. It is also a hammered finish adding a classy look to the glass. Copper Quality: Glass is manufactured with pure copper both inside and outside of the bottle. Leakproof and Jointless: The bottle is made with a single piece of copper without any joints and hence we need not worry about leakage. The lid is made in a way making the opening and closing of the bottle smoother. A high-Quality Washer is used to make the product leakage. Travel anywhere without fear of leakage issues.