Food Grade Safety Material304 class food grade non-corroding stainless steel, which is tasteless, reusable and durable. The liquid inside are water and some other food grade elements, which assure you a safe and healthy drining way. Easy to UseKeep the stones in freezer for 4-5 hours to make it solidify and cold, put 3-4 cubes to your favorite whiskey, beer, wine and drink, then you can enjoy your cool drink. No DilutingNot like the ice cube which make your drink diluted, The stainless steel can keep your wine, beer and drink at the original test without any diluting. Best GiftThe reusable stainless steel ice cube is your best and luxurious gift to your family and friends. This chilling ice stones can be used at home, office or party for a pleasant time. Easy to Clean and StorageThe ice cube is make of stailess steel which is easy to clean and you can wash itin the dishwasher or by hand. Always use the included nonslip rubber-sleeved tongs to avoid freezing your fingers, and allow for gentle placement inside your glass.