About: http://webisa.webdatacommons.org/156181398

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	Flaps could be made out of materials such as expanded polytetrafluoroethylene (ePTFE), silicone, Dacron, and combinations of these materials possible through lamination, calendering, and other techniques.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com