Our heart shaped cupcake pan is made from premium thick food-grade aluminum foil which enable the baking cups to be durable and stable. These flan cups have smooth surface, slightly waterproof and oil proof, and can withstand temperatures up to 428 Fahrenheit, won't fade in the oven. Just put them into the oven and take them out directly without a baking tray; They can keep the original shape well，provide strong support and convenient storage for your desserts