Casabella Boxed Muffin Cup, Large, Multicolor, Set of 6 Made from highest quality FDA approved food grade silicone Silicone resists stains and odors; Non-stick micro textured surface Freezer to oven safe from -58 degrees F (-50 degrees C) to 500 degrees F (300 degrees C) Great for making muffins, cupcakes and frozen treats; Can also be used as candy or snack cups Each cup is 4" in diameter