This server is made of heatproof glass and was originally designed for the microwave. It is fitted with a lid, surrounded by silicon, and the server with its lid can be placed in a microwave. Lid fits snuggly within the carafe's neck.
Today, however, many companies and inviduals use this range server as a receiver of freshly brewed drip coffee. Hario filter cones can be placed directly atop the range server, which in turn, provides easy pouring of brewed coffee. The word Hario means 'King of glass' in Japanese.