About: http://webisa.webdatacommons.org/341595387

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	Such masks can be composed of stainless steel, aluminum, cobalt chromium alloys, titanium, niobium, tantalum, tungsten, or ceramics such as alumina, zirconia, or tungsten carbide.
http://www.w3.org/ns/prov#wasQuotedFrom	google.ca