Parker 5th refill, Refill & ink series  ink

Length without shipper cap 109.25 mm
Diameter without shipper cap 7 mm
Writing tip: Extrusion moulded POM with stainless steel adapter.
Front section: Polypropylene (PP), Black.
Refill system: Advanced absorber technology; constant flow.
Ink: Waterbased, light-resistant and water-resistant (not water-proof)
Exclusivity: Exclusive design. Can be used only with specifically designed nib assembly.
Ink Flow: Stable, regular ink flow throughout the life of the refill
Altitude test: No leakage (for example under airplane flight conditions)
Thermal shock cycle: No leakage (for example under heated car condtions)
Flexibility of front area: Flexible up and down movement of front area, gives a fountain pen nib like feel.