This is the Marvel Four Button Set 2 w/Spiderman Symbol variety pack, featuring Captain America's, the Punisher, Spider Man, and the X-Men's symbols! I'm not entirely sure if there is a clear cut association here other than they are all Marvel! Well, I suppose Cap and the Punisher have some glancing connections with all that Civil War and assassination thing. The Punisher as Captain America was pretty cool, that's for sure. Um, I'm not entirely sure about the connection between Spider-Man and the X-Men. The X-Men are all mutants from birth, while Spider-Man is kind of a man-made mutant. I'm kinda grasping at straws here. Get the Marvel Four Button Set 2 w/Spiderman Symbol and enjoy the 1.25 inch buttons!