About: http://webisa.webdatacommons.org/436893148

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 frustoconical members, and axially elongated members, if present, are preferably fashioned from polyethylene or other plastic material providing a durable light-weight structure from which hardened cement can readily be removed.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com