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Olympic Medal 08
OEM
Silver medals usually have a sterling silver grade of .925 (92.5%) grade. In addition to this property, all the other measurements remain the same. Other requirements are that the medals be circular with a diameter of no less than 2.362 inches and a thickness of 0.12 inches or more. Silver medals should also have the sports details engraved on them.
For the bronze medal, NOCs carefully makes an alloy of copper and other elements, usually tin and zinc, to form a strong bronze medal that is resistant to erosion. The three metal compositions are 97% copper, 2.5% zinc, and 0.5% tin. The size and dimensions remain similar to that of gold and silver medals. Prior to the 1904 St. Louis Olympic Games, only the first two positions got awarded.
The IOC medal regulations allow NOCs to use the official Olympism design on the front of each medal and add a local design at the reverse.