Assertion: narwhal's tusk | /r/HasProperty | hollow
Facets:
value: despite its rather formidable appearance
type: OTHER
Source sentences:
text: Despite its rather formidable appearance, the tusk is hollow and weighs only about 22 lbs (10 kg).
text: The tusk is a hollow tooth, which always spirals counter-clockwise from the left side of the skull.
text: The tusk is hollow and weighs only around 10 kg (22 lb).