 Metal
Well, first of all, it's a photograph, because I have that same camera looking at me from the top of my monitor as I type.
Second, the .jpg appears to have been converted to a .gif at some point due to the dithering, which has been misread as metal flakes. It's simply noise levels to smooth gradient transitions.
Third, it can be rendered in photoshop just like illustrations were done in the old days...good drawing skills, and judicious painting...
This is about 10 minutes at the size and resolution you see posted. If I were rendering it for a client, I would take longer, and work from a MUCH bigger image at a higher resolution...No fancy metal or plastic tutorials, no texture needed; just layers, circular gradients, monochromatic noise, and some airbrushing...and this is real rough. Given a couple hours, you could make a good photorealistic illustration.
Always remember the old adage of Keep It Solidly Simple! Professionals do not over analyze images, it costs them money. If you learn to use the tools available in Photoshop, you will soon visually recognize the components that make up an illustration, and the basic skills to recreate them.
PRACTICE. DRAW. EXPERIMENT. You'll learn more that way that will stay with you far longer than spending far more time than you need looking for a tutorial. Keep in mind that tutorials are someone else's interpretation of using the same tools, and most of the "simple effects" are nothing spectacular, just directions to the basics that many people never bother learning to utilize...
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