About: http://webisa.webdatacommons.org/322505535

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 first limiting rings 32 and the spacers 34 can be made of a material such as quartz or silica.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com