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The Kirschbaum Competition string has a monofilament base, although it could not be called "classic" polyester string. By using new materials we have increased both the power and the potential to obtain effects, as well as the maintenance of tension.
The octagonal profile of the Kirschbaum Spiky Shark string allows for easy topspin and cut strikes, with the creation of different apexes that favour grip on impact. Spiky Shark, made of lightweight polyester, also offers good punch and excellent control, and is easy to string compared to other polyester strings. Thickness: 1.25 or 1.30 mm