Final answer:
Viking helmets were primarily made of bronze or iron, with additional materials like leather, air-hardened bitumen, and wood sometimes used.
Explanation:
Viking helmets were primarily made of bronze or iron, with a leather cap worn underneath for added protection. Some helmets were also adorned with figural elements carved from air-hardened bitumen. Additionally, wood was another material sometimes used in Viking art, including helmets, due to its easy carveability and abundance.
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