A Stapling question?

Happy New Year to All:

Just something I've been thinking about, what are the staples made of, metal, plastic or other materials? What happens to the staples after you recover, do they melt away like sutures or do they stay in place forever? If they melt away or fall off do they stay inside your body forever? I know sutures dissolve causing no harm to the patient, but what about the staples.

I was a professional automotive trouble shooter for 40 years, working for General Motors and Goodyear. I am now retired, but during my time in the automotive business I saw and used many different tools some preformed well others failed. This brings me back to the stapler surgeons are using during WLS, are they the best or are they the cheapest the hospitals can buy, think about it?