Singing Magnetss go by many names such as: Rattlesnake Eggs, Zingers, Orbz, Buzzing Magnets, Buzz Manets, Stunt Magnets, Hematite Power Magnets, Chatter Stones, and probably other names as well. Whatever you call them, these are very powerful hematite magnets with an oblong shape that's a fun toy for any one. You can toss them in the air towards each other and their magnetic fields will pull them together, creating a singing / buzzing noise. You can also hold one and make the other roll and spin around using the magnetic force to move them or put one on top of a table and move it with the other one from under the table. They can also be spun like a top. Singing Magnets are approximately 1 3/4 inches long and 5/8 inches around the middle.