It seems nothing. It's nothing fancy, but it's also cheap and gets the job done. I've noticed that many other people complain that their pen broke straight away, I haven't had such a problem. I could see where it can break if you handle it a little roughly, the handle is hollow plastic but I've used it a few times with no problems. My daughter even plays with it and puts it in her mouth. It also comes with a lid that covers it to keep it clean between uses.
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