Curiosity is the very trait that allowed our species to climb up from the status of animals to eventually form tribes of hunter gatherers, with these tribes subsequently settling down when they each individually discovered agriculture in the four or five initial societies that emerged six to twelve thousand years ago. After all, a curious mind is far more likely to want to try to see if it can put two and two together, so suffice it to say that you should always satisfy your curious urges at this current point in time since doing so can help you become a stronger, smarter and better developed person without a shadow of a doubt.
One thing that you might be rather curious about as of late is what people usually add on Metal Business Kards and the like. Business cards are central to the functioning of monumental profit making entities that are valued in the billions of dollars, and as a result of the fact that this is the case learning what they prefer to add on business cards can help you see why they make the decisions that they do by contextualizing them based on the available data.
The most common thing to add on a business card is some kind of contact information due to the reason that this is the only thing that will fulfill the sole purpose of such cards. You would want to hand business cards out to people so that they can get in touch with you if they start to get interested in the things your company says it can offer, so adding contact information is not negotiable to any extent at all.