aluminium
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A Conveyor belt's head pulley is also known as the drive pulley, its on this end of a conveyor system where the motorized pulley is installed. At this point the conveyed material is discharged "wherever" and the belt wraps around and begins its return cycle. The head pulley is at the discharge so that the conveyed material is "pulled" through the system vs. having the tail pulley motorized which would be forcing the system to "push" the belt containing the conveyed material.
An alloy of aluminium is used usually magnellium
the metal used in building most planes is alumiun as this type of metal as it can expand as the pressure in side the aircraft is greater than the pressure outside the aircraft. it is also the lightest suitable metal although boeing's 787 has been constucted with acompisite material.
Fixed Pulley and Compound Pulley.