Amazon.com: Parker Gel Rollerball Refill for Roller Ball Pens Medium Point Blue Ink 12-Total refills : Office Products
Amazon.com: Unibene Parker Compatible Rollerball Refill 6 Pack, 0.5mm Fine Point - Blue, Smooth Writing Replaceable German Gel Ink Pen Refills for IM Sonnet Urban Pens : Office Products
Amazon.com : Parker Rollerball Pen Refill, Medium Point, 0.7 mm, Blue Ink, Pack of 6 : Pen Refills : Office Products
Amazon.com : Unibene Parker Compatible Ballpoint Refills 12 Pack,1.0mm Medium Point-6 Black&6 Blue, Smooth Writing Replaceable German Ink Tactical Pen Refills for Parker Ballpoint/UZI Pen : Office Products