SQUEAKER shakers usually have a noise maker built into the base of each shaker that makes a meowing or crying noise whenever the shaker is turned over.
The device that makes the shakers squeak is shown above. These devices have a weight that drives the air through thin paper layers. It is unusual to find an old squeaker set that still works because the paper deteriorates with age and did not tolerate washing well.
Some more recent shakers have battery operated noise devices that say something or make a noise when the shaker is tipped.