☛Reezering quick-double wall insulation filled with crackling gel, the cups will keep your drinks cold quickly! Note: Please keep the cups liquid free as possible, there is no water when freezing in the refrigerator.Safe ☛to use-BPA free acrylic material, the cups are safe to use for any drink. We suggest that you place the cups upside down in the freezer for 2-4 hours. The freezer gel is securely between the double walls of the glass, it does not touch your drink. ☛The unique gel shows a frosty appearance between the drink and the cup. Red, yellow, blue, orange, four colors randomly. ☛Do not touch the drink directly-Do not touch the drink, keep the drinks in the original taste, which gives an instant ice-cold effect. ☛ customer --We stand behind our products with customer guarantee. If you are not satisfied with the product in any way, please and we will correct any problem with the product. OOTDTY