About: http://webisa.webdatacommons.org/208251799

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 bottom 20 may be made of (1) a single material, such as a flexible aluminum foil or polyester, or (2) a dual layer structure with an exterior surface 22 and a support surface 24.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com