Cerro Manganese Bronze Ltd, formerly Delta (Manganese Bronze) Ltd, is a member of the Marmon group of companies. The company was established in London in 1876. It was one of the first in the world to extrude aluminium bronze and other copper based alloys. In the proceeding years, we have become a world leader in the manufacture of bronzes and special brasses by extruding, forging or hot rolling.

Cerro Manganese Bronze has a global reputation for quality which has enabled us to be recognised by many of the world’s leading contractors for defence and aerospace.

The company has approvals to BS EN ISO 9002, Civil Aviation Authority (CAA), Rolls Royce, Boeing, McDonnell Douglas, British Aerospace and British Airways.