A popular change to make to a pen is to swap out the included ballpoint refill for a smooth-flowing gel one. Gel refills are quite popular these days because they write well, the ink looks great, and they are fun to use. Ballpoints have these uses of course, but if you are predominantly writing paper
Good gel ink refill for an older rOtring 600 ball pen (Parker style refill, I think) - It Writes, But It Is Not A Fountain Pen . - The Fountain Pen Network
EnerGel® Liquid Gel Pen Refill, 0.7mm NEEDLE Tip – Pentel of America, Ltd.
Equip your favourite Gel Parker ballpen with a reliable and fluid gel ink to enhance your writing experience. This gel ink has water resistant properties and will provide you with the smooth feel of a rollerball to enhance the ease and comfort of writing, without leaving unnecessary mess. Suitable for most Parker ballpens.
Parker Gel Ballpoint Pen Refill Medium - Single / Black
Adapter: Parker G2 To Pilot Frixion Multipen (DWBPLJ9EH) by Tofty2
Parker Gel Pen Refill Fine Point 0.5 mm Black - Office Depot
Parker Pen Refills - Fountain & Ballpoint Refill Collection – RefillFinder
Monteverde Parker Style Bold Gel Ballpoint Pen Refills - Pen Savings
Gel Pen Refills: Buy Best Quality Gel Ink On Sale - Goldspot Pens
Parker Compatible GEL Pen Refill - Cottage Mills
Sold Individually Convert your twist-action ballpoint pen into a smooth-writing capless rollerball! This Parker-Style refill fits over 90% of the
Monteverde Capless Gel Pen Refills (Parker Style) - Purple - Fine Point
Ask The Desk: Parker Refill Pens & More Refill Options - The Well-Appointed Desk