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What is the ring magnet used for?

What is the ring magnet used for?
 
1.  Ring magnets are usually used in science experiments such as a demonstration of magnetic repulsion where the magnetic rings are threaded through a wooden pole. When the same poles of the magnets face each other they won't touch.
 
2. Ring shape magnets are also used for speakers.
magnetic speakers use a magnet to produce mechanical vibration (sound) through the interaction between the magnetic field created by the pulsating electronic signals passing through a coil suspended in the strong magnetic field of the magnet. The ferrite magnet and NdFeB magnet can be used for speakers
 
3. NdFeB Ring magnets are occasionally used in medicine.
Magnetic therapy is an alternative medical practice that uses permanent  magnets to alleviate pain and other health concerns. So-called therapeutic magnets are typically integrated into bracelets, rings, or shoe inserts, though therapeutic magnetic mattresses and clothing are also on the market.

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