Pk/10 Schneider Express 735 Ballpoint Refills, Black M Parker-style BP [or Gel] refill will generally fit: Acme&reg;, Aldo Domani&reg;, Aurora&reg;, Bexley&reg;,Bossert &amp; Erhard&reg;, Visconti&reg;,Yafa,Omas&reg;, Parker&reg;, Stainless-steel tip ensures smooth and consistent delivery 0.6mm medium point, Black ink, Sold As 1 Box of 10 Refills Made in Germany Ink is Waterproof