The cake mold is made of 100% food-grade silicone, BPA - free and FDA approved, 100% non-toxic silicone with no aftertaste. Each size is 3.50 inch x 3.40 inch. The flexible silicone and non-stick finish allow for easy release of baked goods and desserts, easy to clean, compression deformation, can be used repeatedly. Temperature Safe from -104 to +446 degrees Fahrenheit (-40 to +230 degrees Celsius) Safe use in Microwave, Oven, Refrigerator, Freezer and Dishwasher.