About: http://webisa.webdatacommons.org/306465242

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 end ring portions 11 may be made of metal or plastic, or the required rigidity may be achieved in a single molded piece, depending on the forces to be encountered in particular applications and other considerations of use or cost.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com