Assertion: speed skate's wheel | /r/MadeOf | hard polyurethane
Facets:
value: with hardness (durometer)
type: OTHER
value: extremely
type: DEGREE
Source sentences:
text: The wheels are made of an extremely hard polyurethane, with hardness (durometer) approximately 99A. The wheel sizes are relatively small so that the boards are lighter, and the wheels' inertia is overcome quicker, thus making tricks more manageable.