Safe Nontoxic Material - Made of food-grade silicone, which are certified by LFGB and BPA free, chemical-free,lead free. Recommend boil the ice cube trays for 30mins or a few hour when first use, then use pure water to fill ice trays and frozen. And you can put the ice cube trays into your dishwasher after use, easy to clean up. Stackable Removable Lids - The ice cube trays come with a silicone lids, not only prevents spills, but keeps the contents inside from absorbing freezer odor or taste. The ice trays also stack easily without sticking to each other,helping to keep your freezer neat and organized. Easy to Use Multifunction DIY - Applicable to -22 ~ 446, soft silicone materials wont crack or break even after long freezing. This set of silicone ice cube trays is not limited to make ice, its also ideal for making all kinds of DIY ice food like ice cream, pudding, jelly and freezing fruit, juice, whisky, cocktail, yogurt, coffee, baby food and more. Eco-Friendly Reduce Waste - These ice cube trays are reusable and washable, helps protect our ground, rivers, and marine life, Reduce pollution of disposable plastic and damage to the environment. Also impress your family and friends to use this reusable silicone ice cube trays. Reduce use or discard the plastic ice cube trays.