About: http://webisa.webdatacommons.org/123499635

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Examples of suitable head materials are metals such as copper (Cu), aluminum (Al), titanium, and iron, particularly aluminum and copper.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com