I bought these for my 20 month daughter, who already uses normal crayons and pencils quite happily. I thought these might be a fun alternative, however although my little girl was very excited in these when she saw them, she quickly lost interest as they are just too difficult to use properly.
The felt tip is just a small area which is not raised, on the top of the animal, and the pen has to be turned upside down and be exactly perpendicular to the paper to work. This is a really poor design, and a complete waste of money - don't bother!