About: http://webisa.webdatacommons.org/15990960

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 non-magnetic support can be made of any material such as wood, rubber or plastic, and it preferably should be annular or circular to provide for movement of the ball.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com