Assertion: walnut's shell | /r/HasProperty | hard
Facets:
value: very
type: DEGREE
Source sentences:
text: Its origin is unknown and has been grown in Spain for a long time; the tree is very productive, and the shell of the nut is very hard. '
text: Toyo Tire evaluated that the shell was very hard and that the fragments were sharp, and it became to be used as a material for snow tires (studless tires).