12 Pack - Schmidt 888 Black Medium Rollerball Refill Medium Tip - Black Ink - Standard size ceramic tip roller ball refill by Schmidt. Fits 98% of all Rollerball pens that accepts a standard size refill. Refill Reads: SCHMIDT Safety ceramic roller 888 M non-dry refill. Length: 4 5/16 inch (11cm), Diameter - .245 inch (0.62cm) Made in Germany