The Ashaway MonoGut®ZX Pro 17 tennis string is a great pick for players looking for comfort and power at a reasonable price. Combining attributes usually found in natural gut and excluding polyester as part of the makeup of this string, players can be confident in their shots on the court. This string is great for players looking for a string that is easy on the arm, but still provides a high power level. MonoGut®ZX 17 is 100% Zyex monofilament without a polyester additive. Affordable string that provides a comfortable, natural gut feel.