Assertion: drum's drum head | /r/HasProperty | stretched across the opening of a bowl
Facets:
value: in aluminum
type: LOCATION
value: in less expensive models
type: OTHER
value: in fiberglass
type: LOCATION
Source sentences:
text: The basic timpano consists of a drum head stretched across the opening of a bowl typically made of copper or, in less expensive models, fiberglass or aluminum.