Size: 2.6 x 2.5 x 1.1 inches (6.6 x 6.3 x 2
Weight: 0.7 oz (21 g)
Materials: Resin part: Styrofoam resin (heat-resistant temperature 154°F (70°C)), Metal parts: Stainless steel
Country of Origin: Japan

Just drill small holes before boiling. ;Water is entered inside the shell, so the boiled egg shell can easily be removed

People use a pin to make a small hole in the shell at the large end of the egg before they put the egg in the water. At the large end of each egg is a small air space. When you hard cook an egg, this air heats up, expands, and escapes through pores in the shell—but not before the egg white sets. This leaves the egg with a flattened end. Pricking the egg provides a quick escape route for the air, which gives you an egg with a smoothly rounded end. If you prick an egg, watch for a jet of air shooting from the hole as the egg cooks.