Ink cartridge, Astra, Zenith, Blue

Gender: M, W
Age: 3 years old
Blue ink refill. The brass refill tip with high nickel content is equipped with a tungsten carbide ball. Weather-resistant ink, complies with: ISO 12757 vol. 1 and 2, DIN 9001. Ink flow rate in the range of 18-21 mg / 100 m in the writing line.