This Toroid Ferrite is great for suppressing EMI/RFI.
This ring is coated with a tough layer of epoxy conformal coating making it more resistent to breakage. Epoxy color may vary.
Applications range from audio/video equipment wiring, R/C installations etc.
All you have to do is wrap several turns of cable around the bobbin shaped core (more turns = more suppression).
20.00mm O.D. x 10.00mm I.D. x 7.00mm L
Outside diameter: 0.787 inch
Inside diameter: 0.394 inch