Remember Yamaha came out with Beryllium for the tweeter and midrange in the 1970’s. Paradigm followed suite around 2016 with the Persona lineup.
For their new top end speakers, Yamaha did not want to use Beryllium, so they investigated a fibre used to make yachts (if I remember correctly). What’s interesting about this Zylon material, other than the sound and fast properties, is that the tweeter, mid, and the 12-inch woofer are all made with the same material. This makes for a very coherent sound.
I do not need to go and listen since I bought the NS5000 a few years ago. Super detailed, no fatigue, and very coherent.