50 Aluminum Foil Muffin Cupcake Ramekin 4oz Cups This product is made of high quality Aluminum.. With these mini cups, you can make and carry your own muffins/cupcakes easily instead of using the soft and sticky paper cups. Flexible and non-stick. Baked goods Pop-Out easily Excellent heat conduction. Light weight but sturdy. Stronger than the normal papar liners. Oven, Refrigerator and Freezer Safe