This couldn't be simpler! I bought a bunch of 7/16" ball bearings at the hardware store. They were less than 50¢ each! I took some super glue and glued them together, and that is it.
Making them was filmed in real time and took me under 20 seconds.
This super easy project is a blast to use! I dare say you will get a lot of entertainment from playing with these! I know I already have. Give it a shot, you can have a set ready for tonight!