Assertion: pulley's belt | /r/MadeOf | rubber
Facets:
value: with some advertising
type: OTHER
value: usually
type: TEMPORAL
Source sentences:
text: V-belts are preferred if the belt is made of rubber.
text: The belts operated by drive pulleys typically have two or more layers and are usually made of rubber.
text: The most commonly found belts for 3D printers are made of rubber with some advertising that they are re-inforced with fibre glass.