1. FOOD GRADE SAFETY MATERIAL: This ice cube tray is food-grade silicone, and durable, odorless, and BPA-, ensuring user and peace of mind while using the ice cube tray. 2. QUICK FREEZING & MELT SLOWLY: This cylinder shape keeps drinks colder longer by melting slowly and diluting less. The ice cube tray allows the ice cubes to be stacked, making them compatible with a tumbler cup and for individual use in drinks, coffee, or cocktail glasses. ice cube molds are versatile and Can add a cool flavor to your drink. 3. EASY TO OPERATE: Pour water into the ice mold silicone, cover it with the lid, place it in the zer, and when it's time to enjoy your drinks, Just peel off the outer mold and squeeze the cap to release your fresh ice. Add some hot water and pour it around the ice tray lattice for better ice release if needed. The perfect ice mold silicone in various sizes can be matched to fit into your 40 oz tumbler cups. 4. APPROPRIATE SIZE: Our ice mold can create 3 large hollow cylinder ice cubes, for chilling beverages in larger containers, such as pitchers or 40 oz tumbler cups. The larger size of the ice mold ensures a slower melting rate, helping to maintain the drink's temperature without diluting it too quickly. Let's Chill any beverage in style with these large ice molds this summer!