Assertion: ball bearing's ball | /r/HasProperty | hard
Facets:
value: very
type: DEGREE
Source sentences:
text: The downside of Silicon Nitride is that the balls are hard, but brittle.
text: The balls are then hard ground.
text: This ball will be very hard, and highly magnetic, but it is not corrosion resistant and will test positive in any of the corrosion tests.