The history file describes Talos as being made of iron. However, according to the myths, he was actually made of bronze.
One of Zeus' many lovers was a mortal woman named Europa. In the form of a white bull, Zeus spirited her away to the isle of Crete, where she had 3 sons. Zeus had Hephaestus forge a giant of iron to defend Europa and the island. Talos was powered by a single blood vein that ran from his throat to his ankle. The vein was sealed with a pin at the ankle.