Tiroth,
i really hat to say what i have to say as i do not want to spoil Gintaras' business; several folks i have correpsondence with second he is a nice and honest guy.
But i am afraid the cap in question has a magnetic housing, Gintaras is so kind as to thouroughly decribe his cap.
He sez the cap is hermeticized and from the pixes i would say that housing constriuction is the same as with the American Teflon caps i had from Allen Wright for test. Those Teflon caps killed the music when used as a couling cap, i sensed the sound as an attack, my solarplexus was trying to cramp together, they made me escape and run after 10-20 minutes whereas with the MKVs i had to put a force-stop after 40 hours of listenings.
Hermeticized housing means magnetic housing in 99 out of 100 cases, and caps with magnetic housings sound like crap to my ears. So my hint: ask Gintaras if the caps are magnetic or order a test sample from him. If the cap is magnetic, stay away from it, no matter if it is Teflon.
Another hint, scan this forum board for my posts concerning MKV caps, might have some useful info for you.