Premium quality: Made of sturdy and durable material, these high-grade premium quality ice cube molds are designed and patented in the US and the European Union. Permanent home bar item: Silicone ice molds last forever and make slow-melting fun skull ice cubes (2"x2.36") for your events. great for house parties, home bars, holiday events, and holiday gifts. Easy and safe to use: BPA-free, non-toxic, food grade, leak-free, microwave safe, oven safe and dishwasher safe. Perfect for the whiskey drinkers: The ultra-slow melting ice skulls will not dilute your drink, preserving the taste and the strength of your favorite Scotch, Irish whiskey, or Bourbon. A gift guaranteed to create lots of buzz: These molds will make a toy for everyone regardless of age and gender.