The magnetic balancing act results in a wide variety of mysterious chirping noises what are at once both unnerving and mesmerizing.

N123 - "Zingers", Maganites.

Great novelty item! Called Zingers, Singing Magnets, Rattlesnake Eggs,
Locust Magnets, Buzz Magnets, and a dozen other names. Whatever you call
them, they're always sold in pairs. They "sing" and dance, producing a loud buzzing/clicking sound when you toss them up in the air.

Price:   $ 5.50 set