Its material make-up is a blend of polyester, copolymers, and a large portion of a secret material that Signum Pro does not want to disclose.
I find this string to have average level of stiffness for a polyester.
It offer high controllable power. Pretty useful.
Pretty decent feel for a polyester.
Material : Polyester/copolymer/???
Structure : Mono-filament
Shape : Round
Colour : Anthracite
Gauge : 1.18mm, 1.24mm