Food-Grade Silicone molds, durable and easy to use, heat resistant from -40 to 445 F degree, can be used in microwave, oven, refrigerator, freezer and dishwasher .The Chocolate sphere molds is easy to demold , with a simple twist and slight push, you will easy pop out your chocolate jelly inside . The dome molds can be made a ball if stick together, and can create different sizes of dome within the mold measurement .