Monteverde Capless Ceramic Gel P41 Ink Refill Compatible with most Parker Style Ballpoint Pens - Black (Extra Fine 0.5mm)
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6 Pcs/lot Parker Ballpoint Pen Refill Gel Ink Pen Refill Rollerball Pen Refill 0.7mm Or 0.5 Mm Black Or Blue Free Shipping - Gel Pens - AliExpress
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4 Pack - Monteverde Capless Ceramic Gel P41 Ink Refill Compatible with most Parker Style Ballpoint Pens - Black (Extra Fine 0.5mm)
Comparison of Parker-compatible refills : r/pens
Parker Quink Rollerball Roller Ball Pen Refills Ultra Fine UF 0.5 mm Blue Black | eBay
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