Egg Boiler for Hard Boiled EggsThe egg cooker is made of plastic, allowing you to make delicious egg breakfast with confidence. Egg cooking cups with a safe temperature range of -40F to +248F (-40C to +120C). However, it is not recommended that you use these egg cookers in the microwave. How to use an egg cookerEgg cooker is an excellent substitute for boiled eggs. You can use an oil brush Hemoton 4 Pack Egg Poacher with Brush Egg Cooker Hard Boiled Eggs without Shell Egg Poaching Cups Egg Boiler Egg Maker For Breakfast Sandwiches