What is this material? In the context of a personal project I would like to reproduce the appearance of a commercial product of which I send you a cropped image.

I would also like to point out that I do not have the object in question, but it would seem that it is made from a polymer.  

The product is a case with an embedded electronical card, so heat dissipation is important.

I'm interested by what kind of plastic is really used here. I plan to have the part manufactured by a company, so I think the method used will be SLS

I therefore rely on your expertise in the field of 3D printing to try to identify the material used.



Thanks
Surface finish does not really map to the substrate material, Visually, what you have shown could be glass, ceramic, plastic, epoxy or metal.

The surface finish is a combination of the shaping process, any post processing, and any surface finishing. Most significantly, there are a wide variety of custom paints which are designed to mimic specific surface finishes. This means you could carve an object out of clay, then spray it to give the appearance of being sand-blasted steel (to give a specific example).

The underlying material is mostly irrelevant to the appearance. It will be driven by mechanical/thermal considerations (is this a mock-up, or does it need to have functional wall-thickness), and production volume/cost considerations (is it a one off, or are you making hundreds/millions)?