"Pište černým nebo modrým perem."

Translation: Write with a black or blue pen.

[GreenlandHoubarz]

Is there any difference between "pero" and "propiska"? I thought "pero" was more like a fountain pen.

[VladaFu]

Propiska is a colloquial name for kuličkové pero = ballpoint pen. Pero is any kind of pen but sometimes can indeed designate a fountain pen specifically.

[GreenlandHoubarz]

Mockrát děkuji za vysvětlení :)