I apologize, but I couldn't find any information regarding a specific "Metallica - Roam Mono Blast T-Shirt" in my training data. It's possible that it may be a custom or unofficial design. However, Metallica is known for their wide range of merchandise, featuring various album artwork, logos, and designs that reflect their music and aesthetic. If you have any other questions or need assistance with something else related to Metallica or any other topic, feel free to ask!
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