Questions & Answers about La lámpara es de metal.
Why do we use es here instead of está?
Why does the sentence use de metal instead of literally translating the word made?
In Spanish, the preposition de (of) is the standard way to describe the material an object is made from. You do not need to add a word like hecha (made); simply saying es de metal is the most natural way to say it is made of metal.
Why isn't there an article before metal? Shouldn't it be del metal?
When talking about a material in a general sense to describe what something is made of, you do not use the definite article (el). Just like in English, you say it is made of metal, not made of the metal.