Please read!!! I got this as a gift, barely used it. I'm not sure why the inside of the mug has lots of small scratches. I found it out when I carefully examine it before I decide to sell it. They're less noticeable under normal light, but quite obvious if looking at them under lamp. I tried to take good pictures to show it. Please see the pictures before you decide to buy it. It functions well. I just don't have much need for it.