Zyex MonoGut is a 100% Zyex monofilament with absolutely no polyester in the Zyex polymer. The exceptional dynamic stiffness from Zyex polymer provides the playing characteristics similar to natural gut. The solid monofilament construction maximizes abrasion resistance and enhances string life. Players looking for both gut-like playability and superior durability in a solid monofilament string will enjoy this string's performance.