Large volume brass nickel-coated refill. The tip of the high nickel content brass refill is equipped with a tungsten carbide ball. Archival ink, resistant to atmospheric agents, complying with: ISO 12757 vol. 1 and 2, DIN 9001. Ink flow coefficient in the range 18-21 mg/100 m in the line of writing, i.e. a soft and reliable beginning of the line.