About: http://webisa.webdatacommons.org/252073442

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	These tubes may be made of any rigid material including without limitation PVC or other plastic, hard rubber, aluminum, brass, copper, steel or other metals, or even paperboard.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com