They have different colored bands.
Blue, white, red, and brown.
(If my memory serves me right, Blue is Neptune, White is Jupiter, Red is Venus, and Brown is Mars).

Thanks for that (i already knew that). I was asking if there was a detectable way to recongize them. Since e2 doesn't have eyes, I was wondering if it had some kind of skin to make the bands different colors. Thanks for trying to help me out, though!