It appears that the Staedler 309 Handwriting pen has been popular with schools for several years. It’s also said that this plastic nibbed pen creates a slight resistance to the paper. The effect being that it reduces the speed at which you write, hence the reason it is often the pen of choice in schools.
The Staedtler 309 has a moulded grip area, a pocket clip indicates the ink colour, they are available in blue or black.