About: http://webisa.webdatacommons.org/337124555

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	Preferably, the risers are also formed of a lightweight material, such as cardboard or plastic.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com