The only complaint from my side is that there are no refills for the pins. Since the manufacturer Schneider puts noisy pack imprint great importance to a wear-resistant stainless steel tip if the writing fluid is used up, but the whole pen should be discarded. I find that very unfortunate - and also leads in my review to one star deduction.
Thus remain solid four stars. The pens contained six (in the "ink" colors black, red, dark blue, purple, dark pink and orange) represent a reliable writing aid. The price / performance ratio is also not objectionable.