This cover is described as ''Mesh Metal Material'' but it appears to be stiff ABS plastic with a tiny aluminium plate inscribed 'Galaxy S'. That said, it is very light, a perfect fit for the back & sides of the phone and provides a very good grip when holding. I chose this case as I carry the phone in my pocket and need to be able to get it out easily, which the the thin, sticky silicone 'cases' don't allow.