They are classic Italian coffee brewing devices designed with an eight-sided shape for even heat distribution.
The bodies are typically made of durable aluminum alloy and feature a bakelite handle that stays cool during use.
They are available in various capacities, such as 3-cup (120ml) or 6-cup (300ml).
To use, water is heated in the bottom chamber, creating pressure that forces the hot water through coffee grounds in a middle filter, and the brewed coffee collects in the top chamber.
They are generally suitable for use on gas or electric hobs, but not typically induction cooktops.