Metallurgical coke is the raw material for heating and finally melting the metals of the foundry such as cast iron, copper, brass, aluminum, antimony, lead, etc. when the metals have been heated enough they melt so that it is now easy to shape them into a new shape as we have shaped it in molds. Depending on what I am going to cast is also the grain size of the metallurgical coke. This is how it is written from 10 millimeters to +100 millimeters.