This bowl set is made with high-heat BPA and melamine free plastic, perfect for all your food prep needs Our mini prep and serve bowls are perfect for organizing ingredients and just the right size for serving small portions These bowls are microwave safe, making them convenient for quick and easy meal prep Each bowl exterior measures 4.1 inches in diameter and an interior diameter of 3.7 inches. The bowls are 2.1 inches in height. Proudly American Made since 1946