They are almost always small structures, usually made of cheap or recycled material like fibrolite (asbestos cement sheet), corrugated iron, or used timber. They were influenced by the backwoods cabins and sheds of the early settlers and farmers. Other baches used a caravan as the core of the structure and built extensions onto it. Many cities were dismantling tram systems in the 1950s, and old trams were sometimes used as baches, most noticeably on the coast of the Coromandel Peninsula on the Firth of Thames, to which more than 100 trams were relocated.