About: http://webisa.webdatacommons.org/15014195

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	In addition to balls solidly cast of a lightweight material such as rubber, other materials such as plastics having a suitable frictional coefficient may be used.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com