Description Pack of 5 Schmidt 5888 Medium Tip Blue Ink Metal Body Safety Ceramic Roller Ball Refill. FeaturesStandard 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”Made in Germany Technical SpecsNib Size: Medium (0.7 mm)Colors: BlueLength – 4 5/16″ (11cm)Diameter – .245” (0.62cm) Extended Information Schmidt 5888 Metal Roller Ball Fits: Acme, Aurora, Bexley, Bossert & Erhard, Caran d’ Ache, Colebri, Conklin, Conway Stewart, Delta, Diplomat, Faber-Castell, Itoya, Jean-Pierre Lepine, Lanier, Marlin, Montegrappa, Monteverde, Pentel, Retro 1951, Recife, Rotring, Stipula, Visconti, Waterford, Waterman, Yafa, Yard-O-Lead, and many other roller balls made in U.S.A., Taiwan, Korea and China.