What is the brand name of the fountain pens that students use in Germany?

I lived in Germany in 1988/1989 and attended second and third grade there. In school, we all used fountain pens. I'm looking for those pens now - not fancy, overpriced fountain pens that are available in America. They were plastic and came in many designs, and were refillable with short ink cartridges. What brand names should I search for?