This ferrite ring magnet is uncoated and weighs 5gm and has a pull force of 0.35kg. Grade Y30BH. It has an outside diameter of 25mm, inside diameter of 13mm and is 3mm thick. Its direction of magnetization is through height.  

Ferrite loudspeaker magnets play a crucial role in the functioning of a loudspeaker by creating the magnetic field needed for converting electrical signals into sound. The ferrite ring magnet is a specialized magnetic component integral to the speaker's performance. Its role is to create a stable magnetic field that interacts with the voice coil, converting electrical signals into mechanical vibrations that produce sound. The specific dimensions and magnetic characteristics of this magnet make it highly efficient in this role. Its Y30BH grade indicates a high-quality ferrite material that provides strong and consistent magnetic fields necessary for high-fidelity audio reproduction. 

The uncoated nature of the magnet helps in maintaining the raw magnetic properties without interference from coatings. The direction of magnetization through the height of the magnet ensures that the magnetic field is optimally aligned with the voice coil, enhancing the efficiency and clarity of the sound produced. The ferrite ring magnet can securely interact with the other components of the speaker without dislodging, even under high-frequency vibrations.  

Apart from loudspeakers, this ferrite ring magnet's dimensions and properties make it useful in other applications requiring stable and precise magnetic fields. It can be used in magnetic resonance imaging (MRI) devices, sensors and various electronic devices that rely on consistent magnetic performance. The lightweight and compact design of the make it a versatile component in modern electronics. 

Ferrite magnets are durable and reliable, with a high resistance to de-magnetization and corrosion, which makes this ring magnet suitable for long-term applications in both consumer products and industrial devices.