I just got the stuff to make these last night
At wal-mart's in the bead/jewelry they had the metal hoops to put around the stems. There were 12 in the package for $1.88. They were called beverage id hoops.
To put the shrinky dink onto the hoops I bought some things called jump rings. Just small circles. Does anyone know what size to make the hole on the plastic to make sure it's big enough once it's shrunk?
Haven't made any yet though.