About: http://webisa.webdatacommons.org/51256002

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 sheet material should in most cases be sufficiently rigid to be self-supporting when folded in cylindrical form, but if it is not, a rigid core of metal, plastic or other hard material can be provided as an interior support.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com