Step 1: Materials and Tools
Step 2: Drill the holes
Step 3: Gluing the magnets in place
Attach each magnet to a nail. Place the nail in a clamp. Insert the magnet into the ping pong ball so that it just pokes out of the ball when resting on your work surface. Now run a small bead of glue where the magnet meets the ping pong ball. Wipe the bead down with your finger and let it fully dry.
Double check that the ping pong balls will attach to each other.
Step 4: Dip the ping pong balls into liquid rubber
White paint could be used instead of the rubber.