It is a unique keychain! A custom 3D printable Lithophane!
It is created from a digital photograph. Once you get it, holding it up and placing a light source behind it, it will reveal the design or scene in the photograph.
We usually want to make a unique gift for girlfriend, boyfriend, children, pet or others, I think a lithophane can be a unique gift!
If you like it, and want to customize one like this, you can contact me. You can select your favorite digital photograph,and then send to me.
The STL file only a sample,i add a hole on it .
You can fine it on my shapeways shop too.
http://www.shapeways.com/product/KNHJXBZYW/3d-printable-lithophane-keychain?li=shop-results&optionId=55147540

If you only want to get the 3d file, you can contact me :
https://www.fiverr.com/s/7uftvu