Premium Ice Ball Molds Perfect Set of 4 Red, Blue, Green, and Yellow. Made From 100% Food Grade Silicon Ice Ball Molds, Ice Balls Will Last Until Your Drink Is Long Gone. Flexible Silicone Makes Taking Your Perfectly Formed Ice Balls Out an Easy Task. No More Shards of Ice in Your Drink with the Ice Balls Retaining Their Shapes and Not Cracking. Whether You Are Drinking Whiskey on the Rocks or Taking a Drink on the Road, the Silicon Ice Ball Molds Will Produce Ice of the Perfect Size and Shape. Oven Proof, Microwave Proof and Freezer Safe