Paper Mate - Refill for Aspire, PhD, PhD Ultra Ballpoint, Medium, Blue Ink, 2/Pack - Sold As 1 PackLubriglide ink system delivers smooth lines and intense color. Expect bold and expressive writing from start to finish. Paper Mate offers high-quality inks you can depend on. Pen Refill Type: Ballpoint; Special Ink Type: N/A; Refill For Series: PhdTM, PhdTM Ultra Ballpoints; Tip Type: Conical.Smooth lines and intense color.Bold and expressive.High-quality.