Ferrite core TKK SFT?59SN

Hello, I hope this is the right forum to ask this.

I am attempting to find the datasheet for the ferrite core SFT-59SN from TKK industries.
It seems a rather popular item, according to the references found on the internet, but the datasheet is nowhere to be found.
Does someone has it, or can at least give me some characteristics (e.g. core material, impedance @ 1 MHz and so on).
Thanks

I was able to find the datasheet, I attach it here, in case someone needs it in the future.
The text is in Japanese, but the impedance curves are undestandable.