About: http://webisa.webdatacommons.org/352872525

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	Said dense center can be made from steel, lead. brass, zinc, copper, and from a filled elastomer or resin having fillers such as powders of barium sulfate, zinc oxide, lead oxide, etc.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com