Assertion: ballpoint pen's tip | /r/HasProperty | gel pen gel ink uses gel ink
Facets:
Source sentences:
text: Pen Oil-Based Ink flows from ​narrow plastic tube and coats a metal ball bearing located at the tip Gel Pen Gel Ink Uses gel ink, which is a combination of permanent oil-based ink and smooth writing of water-based ink Rollerball Pen Water or Gel-Based