About: http://webisa.webdatacommons.org/246280546

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	They are made in a variety of shapes and configurations including round and rectangular, with or without vacuum or magnetic preload.
http://www.w3.org/ns/prov#wasQuotedFrom	globalspec.com