Copplus Hexagonal Brass Twist Retractable Ballpoint Pen, Polished Brass Pen, Compatible with Parker G2 Standard Refills and Fisher Space PR Series Refills(Adapter Needed) Hexagonal Barrel - Unique and anti-roll, preventing pen from rolling down Twist Nib Exposing Mechanism - Interesting way to protrude pen tip Easy Refills Accessibility - Compatible with Parker style series ballpoint ink cartridges Miniature Size - Idea EDC pocket writing instrument for note taking, signature and etc. Hefty Pen - Makes it a smooth writing instrument