DURABLE TO USESemi circular silicone molds can be used over a wide temperature range of -40F to 446F,This durable and flexible silicone tray won't crack or break like plastic tray,You will find that is the best product for making chocolate snacks HOW TO USE OUR SILICONE MOLDS - FIRST, Put the Semi circular silicone molds in boiling water for 5 minutes before using it for the first time to remove the smell of silicone itself (Only the first time). SECOND, Walfos chocolate mold ball does not contain BPA.Non-stick materials are easy to pop out and easy to clean. It is easy to release chocolate from the mold MULTI-FUNCTIONAL USESemicircle silicone molds are safe used in Microwave, Oven, Refrigerator, Freezer and Dishwasher..Can be used for making cupcake toppers, edibles, chocolate snacks, hard candy, fondant, butter patties ,cake decorations, so much more EASY TO USE & CLEANNon-stick design helps to release chocolate easily by pushing the button of the molds. The flexible materials means that they are easy to clean and store