Roller 4615 F ergoline, 0.3 mm blue 4584. Roller with a three-sided body and an ergonomic grip zone that reduces the tension of the finger muscles when writing.
Thin metal nib with tungsten carbide ball.
Does not dry up to 14 days without a cap.
The length of the writing line is 2,200 m.
Disposable.
The width of the trace is 0.3 mm.