Iron powder core is generally stored near signals of place. It has isolation eddy current, low permeability and constant magnetic characteristics. Used widely in power transformers, current transducers, instrument transformers, inductors, chokes, ballasts, voltage stabilizers and regulators, welding transformers, broad band transformers, filters, etc.liul .
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Customers are satisfied with the inductance of these ferrite cores, with one customer noting they make good inductors and another mentioning their low inductance.
It says ferrite in the title, but I am pretty sure these are iron powder type, which has some advantages, but definitely isn't ferrite. The low inductance it the key giveaway that it uses iron powder.
These work well in some joule thief circuits that I built. They are a reasonable size for hand winding. They won't accomodate too many turns of a heavy gauge wire, but they are exactly as described.