The Frosty Beer Mug has 400ml capacity and insulated design. Classic beer mug is filled with amber coloured distilled water that looks like real beer, complete with faux bubbles, inside of its double wall construction. Simply place the Beer Mug in the freezer to cool and it will keep your favourite beverages cool without diluting it. For the best results, place your Frosty Mug UPSIDE DOWN in the freezer compartment of your refrigerator for 2-4 hours, when the coolant (non-toxic) appears frozen, remove it from the freezer and fill with your favourite drink. Feel free to freeze and re-freeze again and again. Do not use in microwave. Do not freeze below -10C. Hand wash only.