... silicone. 2, Non-stick finish, durable, easy-cleaning and efficient different shaped silicone bakeware 1,Tasteless, Nontoxic, Anti-dust ... impermeable.2,Safe to use in ovens,microwaves,dishwasher and freezer.3,Enviroment protective (Accroding to environmental protection standard ... ,Temperature range: -40 to +230 degree celsius7,Flexible,lightweight and portable,easy to store and transport silicone cup