These aluminum tumblers are formed by quality anodized aluminum, with shiny appearances, not easy to break or deform, rust resistant and oxidation resistant, which can meet your long term using needs, not suitable for wash machine or microwave oven. Due to nice material, the metal drinking cups can keep your cold drinks at the original temperature for a long time, bringing you a nice drinking experience, just enjoy your drinking time. When finished enjoying your favorite drink, simply recycle the cup as you would an aluminum can. The Aluminum Cup is lightweight, but can withstand the most enthusiastic cheers, and will not crack under pressure. Bring out the best in your favorite drink with every icy sip.