Assertion: flask | /r/MadeOf | definite improvement
Facets:
value: of metal
type: OTHER
value: generally
type: DEGREE
value: with being the most common
type: OTHER
Source sentences:
text: Today, flasks are generally made of metal — a definite improvement over the leather or earthenware canteens of days long past — with pewter, copper, and steel being the most common.