Instruction: Generate an answer to the question by utilizing the information contained in the document.

Input:
Question: What is the mug made of? Is it lead free? Thank you!
Document: I got this mug on a whim for a friend at work to say thank you for a job well. She is notorious for being sleepy at the morning technical meeting. When I order, I got several extras to use as thank you gifts and for my wife. Everyone, to a person, loves the mug. Unlike some mugs, it actually works. One piece of advice, do not put in dishwasher. This is an inexpensive and fun little gift.
Love this mug!!!!! A creative idea for a mug and it really made us laugh. Got it as a gift for someone
this mug was very cute (: made a perfect gift for a friend and can't ever &#34;break,&#34; (unless you shatter it) so it lasts forever
This mug made a very nice gift. It came in a small white box that was easy to wrap. The only complaint I have is that the transition does show some flaws. But over all was a good purchase.
The mug only made the total transformation once, after only half way. I will pour fresh coffee and it will change only half way. It stays stuck inbetween transformations.
I gifted this mug to my son for Christmas and he was very happy, until I put it into the dishwasher. &#34;Magic picture&#34; was made by a tiny film (sticker) which shriveled up and came off. Sorry.
I love this mug. I found it on FAB for $25, but on Amazon for only $10 this made a great gift for my secret santa. Every morning she enjoys watching her little girl wake up!
I love this mug and it's changing feature. However, when it changes the eyes and mouth from before stays and they look a little silly. However, the mug is well made and I use it often for coffee.
the mug is made in low quality. it is not able to turn to the smile face completely that remains &#34;eyelash&#34; and &#34;O&#34; mouth. In other words, you will see all its expression at once that makes the mug awkward. Won't buy it again.
It does change color from black to white, when you pour hot liquid into it.However, the closed eyes/sleepy face do not fade when the mug turns white - so when hot, you get both which does not look as advertised. Otherwise, made a great gift.
Answer: I believe its an ordinary ceramic coffee cup with a shrink wrap type of sticker on the outside.  After two washing the outside started to peel off.