About: http://webisa.webdatacommons.org/430637136

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	Alternately, the inner and/or outer layers can be made of polyurethane, polyvinylchloride (PVC), polyethylene, vinyl, or other flexible, biocompatible polymers.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com