Blusmart FDA Approved Silicon Ice Ball Mold Tray, Large (4 x 4.5) cm Order 2 or more and get 15% off. Just click above for the current promotion (limited time only). HUGE 4cm balls. Only need one per drink! Lasts longer and melts less. Seals tight, and has integral spill collector to leakage.Food grade silicone will not react. FDA approved. Flexible for easy release; will never crack! Reusable 100,000 of times. Dishwasher safe, freezer safe, refrigerator safe, microwave safe and oven safe. You can even cook with this! 100% Lifetime guarantee. These really last forever! Loved by whiskey connoisseurs, cocktail mixologist and high end bars and restaurants alike, this will add class and style to your party.