☛ KEEP YOUR DRINKS COLD RAPIDLY - Constructed with double-walled insulation filled with crackle gel, the mugs can go in the freezer and keep your drinks cold rapidly! NOTE: PLEASE KEEP THE MUGS LIQUID FREE AS POSSIBLE NO WATER WHILE FREEZEING IN THE REFRIGERATOR, NO DISHWASHER.☛ SAFE TO USE - Made of a BPA-free acrylic material, the mugs are safe to use for any beverage. For Best results, please place mugs upside down in the freezer for 2-4 hours. PERFECT FOR BEER, SODA, WATER - and many other beverages! The freezer gel is safely between the double walls of the glass, so it never touches your drink, yet still keeps it cold.☛ SET OF 4 MUGS - The unique gel shows a frosty appearance between your beverage and the mug. When you need to use, just take out from refrigerator and pour into your drinks, so convenient! A set includes one each with 2blue and 2black, simple, elegant and fashionable.☛ KPPING YOUR DRINKS ORIGINAL FLAVOR - Chill your drinks without watering the down, keep your drinks original flavor, serve any beverage in these freezable glasses for an instant ice-cold chill. You don't have to worry about traditional ice cubes melting and watering down your drink before you finish it.☛ 100% CUSTOMER SATISFACTION GUARANTEE - We stand behind our products with a Customer Satisfaction Guarantee. If you are unsatisfied with the product in any way please contact us and we will correct any issue you might have with the product.