About: http://webisa.webdatacommons.org/268669805

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 at least one embodiment, the shell is comprised of a relatively rigid material, such as a biocompatible metal or ceramic.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com