Five RFC-8 ferrite cores, five white and one bonus black. Unused, but some have slight surface dirt from storage. *Although they appear to be electrical components, I am not familiar with them, so I am listing them after researching with AI. I hope they can be useful to someone who knows more about them or needs them. m(_ _)m - Set includes: Set of 5 + 1 bonus - Color: White - Model number: RFC-8 Thank you for looking.