Credit-card shaped and sized magnets are actually pretty popular as tourist mementos. It's true that they are typically slightly smaller than a credit card, but

Credit-card shaped and sized magnets are actually pretty popular as tourist mementos. It's true that they are typically slightly smaller than a credit card, but they're a common occurrence. And while it's true that the strong force has very complex interactions which make it both stronger and weaker than EM in certain situations, I don't think there is any situation in which EM is weaker than gravity. Of course, the comparison is ultimately apples-to-oranges, as it basically amounts to comparing the amount of electrical charge to the amount of "mass charge". Still, if we compare by, say, the total number of particles with mass/charge respectively of any kind you need two bodies to have to have an equivalent effect on motion through gravitational VS EM interactions, in every situation that we know how to model, you would end with the same conclusion.