The ring shape magnets on the page are made of rare earth Samarium-Cobalt(SmCo) material,which shorted as rare earth Samarium-Cobalt(SmCo) ring magnets. Smco ring magnet are important industry ring magnets,which can work in high temperature environment or in the application with demagnetization factor. Electroplating is unnecessary for samarium-cobalt (SmCo) ring magnets. However, as one of industrial magnet suppliers, we recommend that you use them with care because they are fragile and easy to crack or chip. You can get various customized grades and sizes of SmCo disc magnets from us.Contact us now for quotation!