About: http://webisa.webdatacommons.org/235147353

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	It is usually made from a combination of two or more types of glass, one hard and one soft.
http://www.w3.org/ns/prov#wasQuotedFrom	wikipedia.org