4 Pack - Blue Schmidt 5888 Medium Tip Medium Tip - Blue Ink - Standard Size Metal Body 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 5888 M non-dry refill. Length: 4 5/16 inch (11cm), Diameter - .245 inch (0.62cm) Made in Germany - Distributed by Lanier Pens - USA, Ensure TOP Quality product - buy direct from Distributor!