This is a single-sided multi-pole magnetized ring magnet, only one side is magnetic, there are 4 poles on the surface, 2 N-pole, 2 S-pole, the material is injection molded ferrite, the outer diameter size of 17mm, the thickness of 4.5mm, the surface magnetic strength of about 1140 gauss, such as this size is suitable for you can contact us to provide you with a quote, you need other sizes you can consult, we have a lot of smaller or larger multi-pole magnetic ring We also have many smaller or larger multi-pole magnetic rings.
Single-sided 4-pole ferrite ring 17x4.5mm hole 5mm sample picture
Maybe a more appropriate size;