PM Company Refills For Standard Ballpoint Pen, Medium Point, 2/Pack, Black (PMC05079) Plastic refill is designed for use with PM Company Klipboard Keeper with Pen, Prevent a Antimicrobial Necklace Pen, Versatile Ergo Triangular Coil Pen, and Prevent a Triangular Coil Pen Cross-reference marks are designed for easy identification Refills Simply find your pen cross-reference mark, and snip off