Assertion: ballpoint pen's ball | /r/HasProperty | tiny
Facets:
Source sentences:
text: Ballpoint pens have a tiny ball at the tip of the pen cylinder that uses capillary action to funnel the oil-based ink from the pen cartridge onto the paper; as a result, ballpoint pens do not need to be held vertically in order to write.
text: Ballpoint pens have a small ball in the tip that rolls over the page for smooth writing that dries quickly.