It consists of basalt cobbles for the carriageway, sandstone curbs and clinker brick walkways. The concrete piers are clad in Berlin's traditional yellow clinker brick. The facade of the clinker brick building is decorated with numerous Art Deco decorations. Characteristic features are clinker brick facades and copper roofs. The exterior was built with clinker brick in the Arts and Crafts style. It was completely fireproof&colon; the exterior was constructed of clinker brick and steel. Greppiner Klinker (clinker of Greppin) is a hard-burnt yellow clinker brick. "Clinker" is from Dutch, and was originally used in English for bricks; see clinker brick. These clinker brick buildings have been preserved to this day.