To get good sound from a speaker, you need a strong magnet. Neodymium has the greatest field strength of any permanent magnet known. Speakers made with these magnets have good frequency response, and because the magnets are strong, you can use smaller magnets, reducing speaker size and weight.
Neodymium magnets made high-fidelity ear buds possible, as they can pack a strong magnetic field into a tiny package. However, these magnets shatter easily.
|Outer diameter||100 mm|
|Inner diameter||75 mm|
|Tolerance||+/- 0,1 mm|
|Direction of magnetisation||axial (parallel to height)|