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https://www.racinghalloffamecollection.com/wp-content/uploads/2018-Vettel-_-Raikkonen-Race-Used-Scuderia-Ferrari-SF71H-F1-Rod-and-Piston-99_0005_Hue_Saturation-3.jpg

You can see the piston is aluminum and is anodized, the anodization allows the ring lands to have a better surface finish, and strengthens the structure of the piston. You can also see the trace of the turbulent jet combustion as it fans out from the center of the piston, and the high temperatures near the quench area that have discolored the metal.