About: http://webisa.webdatacommons.org/167881029

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	Further, they are also subject to repetitive knocking and tapping to dislodge espresso after use, and thus rubber and stainless steel are the most commonly used materials.
http://www.w3.org/ns/prov#wasQuotedFrom	wikipedia.org