Seiwa Electric Ferrite Core 13mm (E04SR241336A) Ferrite cores are effective as one method of suppressing and preventing electromagnetic noise. Ferrite cores are used alone or in combination with other components such as capacitors. They are also used in various locations, such as cables and printed circuit boards. Thank you for viewing. ⚠️Caution We inspect items before listing, but please understand that there may be oversights. 【Important】 ・Please refrain from purchasing if you are concerned about home storage. ・Please understand that there may be small stains or scratches. ・Returns are not accepted for reasons such as "different from the image." Please refrain from purchasing if you are seeking perfection.