Private Reserve Ink Brand Schmidt 5888 Medium Tip. This newly developed 5888 Documentary Proof refill is resistant to HCE (Hydrochloric Acid), NH3 (Ammonia), Bleach, ETOH (ethanol), and H20 (water). Black Ink Metal Body Safety Ceramic Roller Ball Refill.

Nib Size: Medium (0.7 mm) Colors: Black Length – 4 5/16” (11cm) Diameter - .245” (0.62cm)

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.