SAFE MATERIAL: These unique honeycomb-shaped ice cube trays are made of high-quality silicone. The silicone material won't crack like plastic ice trays, and is safe from -40 to 464 degrees Fahrenheit. They can be used in the freezer and microwave. EASY TO RELEASE and DISHWASHER SAFE: Ice trays are made of soft silicone material. Each flat cube compartment is separate, so you can easily push from the bottom to release all the ice cubes. The tray is dishwasher safe. STACKABLE LID DESIGN: Easily cover the ice tray with a lid, preventing ice from absorbing other food odors in the refrigerator. These easy-release trays stack easily in the freezer to save space. VALUE PACK: Each tray can produce 37 small cubes. The flexible and durable ice trays can be easily twisted without breaking. ENJOY DIY: Silicone molds give you a more fun experience making ice. Make ice cubes or fill the molds with drinks, iced coffee, fruit, popsicles, puddings, jelly, and chocolate to customize your favorite flavor.