It's plastic, but it has good finish, and I'm not expecting anything fancy. Size is fairly compact, and when used with a smartphone, it doesn't wobble unlike some "premium" metal stands.
Despite being billed as a smartphone stand, you can actually use it to prop up some tablets, like an iPad Air 2. However, you can't do much as tapping on a tablet will force the stand to lower backward. It will also wobble as well.