Assertion: fiber optic cable's fiber | /r/HasProperty | plastic core
Facets:
Source sentences:
text: They are available as glass fibers (a glass core and glass cladding), plastic-clas silica (a glass core and plastic cladding), and plastic fibers (a plastic core and cladding).
text: Optical fiber, either plastic or glass, is both strong and flexible, much more durable than fragile light bulbs.