Newb here, but I gave this some thought. I decided to go with steel shots, since I also like to sling shot. They're essentially steel ball bearings. I figure it's of little value to anyone besides myself, and obviously, they can't be printed on or signed otherwise, so I will only include it with an actual item, bagged together. What'll someone do with a random, single steel shot? Who knows? I'd be interested to find out. (Hopefully not the trash can, but I wouldn't be too sad otherwise.)