In printing, metal type is cast from a combination of three metallic elements. The percentage of each metal depends on the usage of the type but the general rule for type held in the case is:
74 percent Lead: heavy, poisonous, malleable & ducktile but soft & weak.
18 percent Antimony: brittle, but when alloyed strengthens the metal.
10 percent Tin: soft & ductile but wear resistant & fluid when molten to give a finer face to the type.