Copper material is the best cheap material to make the challenge coins or token coins.
Why use the copper material to make the coins?
Normally the coins thickness is about 3-4mm, that will be difficult to cut if use the iron material, so use the copper material will let cut more easy and smooth and more easy for polish the edge.
The copper material is more pure than other materials, without no impurity.
Our copper material content is as following:
That copper is pure copper, also known as red copper, copper is single substance, named because of its color is purple. Various properties see copper. Copper is the copper industry, its melting point is 1083 ℃, no tropical transformation, the relative density of 8.9, five times as magnesium. The quality of the same volume of about 15% by weight than ordinary steel. Because of its red roses, after an oxide film formed on the surface purple, it is commonly referred to as copper. It contains a certain amount of oxygen is copper, which is also called oxygenated copper.  Copper has good electrical conductivity and thermal conductivity, excellent plasticity, easy hot and cold pressure processing, a large number for the manufacture of wires, cables, brushes, electric spark erosion of copper and other special requirements of good electrical conductivity products.