This is a bloody brilliant gift. I was a bit dubious at first, and skeptical about putting it in the oven, but it literally shrinks down in seconds and becomes solid. At first it starts to curl up, and I was concerned that it was game over, but then it becomes flat as it shrinks.
It comes with a little permanent blue Sharpie, which I've been using ever since!
The writing becomes tiny, but is so clear and sharp that it's really easy to read.