Copper Mixing Cups: Copper cocktail mixing glasses: they aren't glass and they'll never break. Exceptionally low ice/water dilution as the conductive copper chills instantly as opposed to the insulating factor of glass that warms your drink. Stirred, not shaken for 20-ounce capacity cocktail concoctions. Our Copper cocktail mixer showcases durability and style for your craft cocktails. * Two styles: Flat bottom and the rounded bottom with pedestal base. * 20 ounce Capacity * Hammer polished for durability * 100% pure copper from recycled sources * Made to last, made to be used, made to look good