Again, these pens are water-based, do not bleed through most paper, are washable and non-toxic. They have a broad 6mm tip which tapers to a 2mm line, so they can be used to colour larger areas quickly and smaller areas when angling the tip down.
Physically, the pens have a thick rounded barrel which is coloured in the same shade as their ink, and they also have a vented cap which prevents choking if swallowed.
Overall I think these pens are really good value for money to say you're getting 36 for the price of 24 :)
Here are some pictures I coloured with both sets of pens.