About: http://webisa.webdatacommons.org/135373904

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 outer part 13a is made of relatively rigid material, for example polyurethane, and the inner part 13b is made of elastic material, for example rubber, which forms a narrow triangle integrated into the rigid material 13a.
http://www.w3.org/ns/prov#wasQuotedFrom	google.co.uk