Very thin. Image quality is good.

I guess I kind of expected the quality to be a little bit better on these magnets. Granted, I paid a whole dollar for a promotional order of 10, so I can't be THAT disappointed. That being said, I don't think I would order them again unless the price was pretty aggressive. I'd rather pay a little more for thicker (like, double the thickness) magnets. The image quality was fine.