Thornton's Luxury Goods Ballpoint Pen Refill to Fit Parker Ballpoint Pens, 1.0mm, Medium Point, Blue Ink, 5-Count The standard ballpoint refill fits many brands of ballpoint pens that take a Parker Style Ballpoint refill. Bold colors and solid lines. Count on consistent ink flow for smooth writing Now with new and improved instal-flow ink. Smoother, long-lasting ink. Medium Point - Blue Ink