1. Temperature Tolerance These microwave egg cookers are made of relatively thicker food-grade silicone, which is BPA-free, environmentally friendly, non-toxic, flexible and less likely to deform. The temperature tolerance range is from -140°F to 464°F (-60°C to 240°C). They can be used on stoves, in microwaves and electric pressure cookers. 2. Making Perfect Hard-Boiled Eggs Spray oil on the egg cups, crack an egg into them, and then carefully place them in boiling water. Wait for about 5 minutes, tilt the egg cooker, and let the hard-boiled eggs slide out. Then you can get a well-shaped hard-boiled egg. If you have difficulty making good hard-boiled eggs with an egg ring, try our egg cooking mold! 3. Cooking Design Cooking Use: Each set of egg cookers comes in 4 different colors. There is an easy-to-reach hole on each side of the product. It's relatively easy to take the eggs out of the soft silicone. When cleaning, just turn it inside out and wash it, or put it directly into the dishwasher. This design allows it to stay stable on any kitchen countertop and is also suitable for the microwave. The egg cookers can be stacked for convenient storage. These egg cooking boxes save you some trouble of using an egg boiling pot. 4. The Multifunctional Use of the Egg Cooker in the Kitchen It can be used as a mold for cakes, desserts and jellies. It can also be used to melt chocolate, heat up spaghetti sauce and steam vegetables. By extending the cooking time, you may even make shell-free hard-cooked eggs with our egg cooker. 5. What You'll Get: A set of 4 hard-boiled egg cups in different colors (purple, blue, green, orange).