Here's a hypothetical metal grade for the Royal Enfield Rockstar 500: Frame: High-Strength Steel (HSS) - Grade 8.5/10 Engine: Aluminum Alloy (6061-T6) - Grade 8/10 Suspension: Steel (Grade 4130) - Grade 8/10 Bodywork: Steel (Grade 1008) - Grade 7.5/10 Overall Metal Grade: 8.1/10 Please note that this is a fictional assessment, as there is no real Royal Enfield Rockstar 500 model. Actual metal grades would depend on the real-world specifications and materials used in the motorcycle.

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