MAGNETICS INC - Powdered ferrite core
Made in Taiwan (sourced from the USA warehouse though)
Part # (Black ferrite core) 7D1X 77071A7
Core material: Kool Mμ®
The world of magnetics can become extremely technical, I DO have the full databook (extremely detailed) from Magnetics should you need an extract from it - just ask.
Ferrite ring (Black Epoxy coated ferrite)
Core is 7mm wide x 10.9mm height
Absolutely no damage at all!
Always been kept in the suppliers polystyrene foam packaging