3 Pack - Private Reserve Ink Schmidt 5888 Blue Medium Tip Metal Body Refill Medium Tip - Blue Ink - Standard size metal body pen refill with stainless steel tip and 0.7 mm Ceramic Ball Tip. Roller Ball refill by Schmidt. The safety technology features extened shelf-life characteristics and it is therefore particularly suited for use in pens without cap sealing. Schmidt 5888 refills fit 98% of all Rollerball pens that accepts a standard size refill. 5888 Schmidt Safety ceramic roller refill with Medium Tip. Refill Reads: Private Reserve Ink 5888 M Ensure Top Quality - Buy Direct from Lanier Pens - Length: 4.33 inch (110.6mm), Diameter - .25 inch (6.3mm) Made in Germany by Schmidt - Distributed in the USA by Lanier Pens