Spotted these Ashaway Oblivion Hybrid strings at Goode Sport. Thanks to Bill for the heads up.
According to Ashaway:
Introducing Ashaway’s first HYBRID squash string…
Powerfusion cross-strings have been specifically designed to compliment the firm feeling Powernick 18 mains strings. By adding softness & feel to a firm and powerful main string, Powerfusion technology produces the ultimate squash string bed.
So I guess the idea is you string the mains with Powernick 18, and then you string the crosses with the Oblivion string, resulting in a softer feel than all-Powernick.