The outdoor wood burning fireplace is made of cor-ten steel, which is almost pure carbon steel but processed to have a protective layer on the surface to make it weather-proof. The surface is originally reddish-brown (resembles the colour of rusting), which becomes darker within time. If used properly, cor-ten steel is expressive, durable and maintenance-free and can stand the time in its own peculiar way. Let light into your garden and convert a dark evening into a pleasant come-together!