Heat Changing Mugs

[Freak724]

I was given several of these mugs. Does anyone know if they are of value ?

 

[VincentVegaFFF]

$12-$15 on eBay.

 

[Mike86]

Kinda cool. I’ve gotten more into drinking coffee since dating my girlfriend and enjoy a cool mug. Only have a couple that are actually mine.

 

[ebor]

Here is my go to coffee mug