About: http://webisa.webdatacommons.org/113318974

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	The ring parts 110, 111 are of a material with a low coefficient of friction such as Polytetrafluoroethylene (PTFE).
http://www.w3.org/ns/prov#wasQuotedFrom	google.co.uk