The tool is made of food-grade silicone material, which is healthy & eco-friendly to the environment, non-toxic, non-stick odorless, and safe. Temperature Range. It is safe to use in ovens, microwave ovens, dishwashers, and freezers. Silicone funnel is perfect for use as heat resistant funnel, protecting your hands and avoiding accidents. About collapsible design, the hence can be easily stored even in shallow drawers.