Staedtler Ball Point 0.35 430 (Pkt) This Staedtler ballpen has a medium tip The ink flow on this Staedlter pen has been regulated to avoid blobbing or scratching. A ventilated cap is standard on the 430 as in accordance with ISO regulations. \tTransparent ballpoint. \tErgonomic triangular ballpoint. \tAirplane-safe, automatic pressure equalization prevents pen from leaking on board aircraft.