Made by Food-Safe Greaseproof Paper. Oven & : Caperci cupcake wrappers can withstand up to 428°F temperature, ideal for cupcakes, and muffins. Oven, microwave, and refrigerator safe. If you're looking for cupcake liners made out of high-quality paper materials that are easy to separate from one another and are also easy to peel off from your muffins, these muffin liners are exactly what you're looking for.