Bodum's Pavina drinkware has a distinctive futuristic look and feel, making it a contemporary departure from traditional glassware. Each Pavina is crafted of two layers of clear borosilicate glass, creating an optical illusion that the liquid floats freely inside. Pavina's shapes are rounded with a modern flair and come in many sizes to suit a variety of needs. Because the glasses are mouth blown, each one is unique and ever-so-slightly different. Note: Because the glasses are mouth blown, each one may have slight variations in height, thickness, and weight. Bodum recommends using care when placing ice into the glass to avoid fracturing the inner layer. Do not use metal spoons or place the glass into a crowded dishwasher.