(Safety: Professional quality ice cube trays are made of food grade, FDA approved, BPA free silicone.) Harmless to humans. For microwave safe, oven safe, dishwasher safe. GREAT PARTY ADDITION FOR FUN: They last longer than traditional ice cubes and the skull shape makes your party amazing for Halloween parties, birthdays, parties, bars, restaurants, summer, holiday events and holiday gifts. Silicone ice cube holders won't crack or break like stiff plastic molds or bowls, are easy to fill, easy to use and easy to clean. Easy to remove: BPA-free silicone holds up even when Gefrohrenen. So you can write a solution to your hockey puck that comes off particularly easily in shape. Get your drink cold: The crystal detailed head shape cools your drink in style, without water, with durable ice cubes ideal for whisky, cocktails, iced coffee, iced tea, juices, soda and cola.