With two times the chilling power of square drink stones, Amazeballs will keep your drink colder, longer. They’re made from food safe stainless steel and filled with a specially formulated food-safe glycerin gel that freezes to chill your drink without diluting its flavour. Simply freeze Amazeballs for a minimum of four hours and then use them to keep 2-3 ounces of room temperature liquid cool for up to 45 minutes. Rinse with warm water, pat dry and put back in freezer in between uses. Set of 2 balls includes tongs and storage bag.