My kids loved these so much, that they were doing them on their own just for fun. Even my 7th grader thought it was fun. Excellent for handwriting practice for all ages. It comes with one pen, but 4 refills. So far we haven’t had to use a refill yet, and it’s been a few weeks of using them everyday. Depending on how hard you press the ink, it usually takes 30 minutes to disappear (longer if you press harder, using more ink) These are truly great! I’m hoping there will be a cursive book soon. A+ ...