Med-Red Ink P900 Schmidt Parker Style Ballpoint Refill Medium Tip - Red Ink - Standard Parker Style ball point refill by Schmidt. Fits all types of pens that accept standard Parker style Ball Point refills. Refill Reads: SCHMIDT Refill P 900 M Length: 3 7/8 inch (9.8cm), Diameter - .230 inch (0.58cm) Made in Germany - Distributed by Lanier Pens - USA, Ensure TOP Quality product - buy direct from Distributor!