Silicone Muffin Mould: Set of 6 - Large (Sillymann Kitchen Tools) FDA Certification All of Sillymann Tools are PLATINUM Silicone. The way of manufacturing, with silicone and platinum catalyst, is used for hi-hygiene and quality medical products, so it is trustworthy natural source rather than other silicone products, in hygiene, durability and quality. Natural silicone products made of sand. Stable in -40~482 degrees Fahrenheit. Micro-wave oven sterilization. Micro-wave and a light wave oven cooking. Easy & Fast cooking available for New life style. FDA Certification, non-toxic BPA-free, no phthalates. Avoid the evaporation from cooking, make food tastier. Colorful colors and design change classy of kitchen. Safe from endocrine disruptor and harms with platinum catalyst method. Shorten the time of cooking, save the money. Not fragile with flexible and soft with silicone.