What materials were used to build Big Ben?

The Great Bell of the Palace of Westminster clock tower, commonly known as Big Ben, is made from 13.5 ton, (13,760 Kg) of a copper/tin alloy known as 'bell metal' or Bronze.

The Clock Tower is made of Brickwork covered by Limestone Stone cladding for the first 200 Feet (61 metres) and the remaining 115 feet (35 metres) is a framed cast iron spire.