Genuine piston mechanisms are primarily offered by Montblanc, LAMY, Pelikan, Aurora and OMAS. Recommendable models are the LAMY 2000 (although without screw cap), the Aurora 88 or Aurora Optima (with reserve-tank function and screw cap), Pelikan Souverän models and Faber-Castell pens. With hybrids like the Cleo Chiffre 05 or smaller Fabers it should be noted that they sometimes only work with a converter. EF nibs tend, depending on the model (e.g. LAMY 2000), to skip. Anyone naming a screw cap as an exclusion criterion rules out the LAMY 2000 and should focus on Aurora or Pelikan.