The products shown in the picture is the Ferrite magnet with the ring shape in different sizes. They are usually called loudspeaker magnet, because they are widely used in the loudspeaker and audio system field.

According to the application demand of our customers, these magnets could be manufacture in multiple sizes. With 10 years production experience and our hard research all the time, now the maximum outside diameter of the ring Ferrite magnets could be 280mm. Meanwhile, as you can see in the picture, the hole could be manufactured to only 5mm or even smaller. The size completely depends on your require.

Regarding the NdFeB ring magnets, we have some customers in Europe who produce the loudspeakers, and they are very satisfied with the quality and the price, and other terms. If you have any demand for these products, please feel free to contact us. We would like to produce them according to your request, the size, shape and the pattern could be unique for you.