Titanium. 
Titanium is a leith metal with good metallurgical characteristics. When exposed to oxygen Titanium creates a layer of ceramic like oxygen film(TiO2) which protect the material against wear and corrosion.
As the material is biocompatibel it is often used as implant -also pacemakers. Also Titanium is often used in aerospace industry.
Can be delivered in pure form or with different alloys as plates, rod or tubes.