Signum Pro Thunderstorm Tennis String

Price range: $21.99 through $219.99 CAD

Experience explosive spin and refined power. The Signum Pro Thunderstorm features a unique 10-sided, axially twisted profile designed to bite the ball for maximum RPMs. Built from a high-elastic co-poly, it bridges the gap between stiff control strings and comfortable performance, offering a crisp feel with elite tension stability.

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Description

Key Features

  • High Elastic Co-Polyester Construction: Developed using Signum Pro’s specialized heating process to provide a more flexible, lively response than traditional, stiff polyesters.

  • Balanced Power and Control: Engineered to offer a “spring-loaded” effect that boosts ball speed while maintaining a predictable, controlled trajectory.

  • Crisp, Comfortable Feel for a Poly String: Offers a distinct, sharp feedback at impact while significantly reducing the harsh vibrations often associated with control-oriented strings.

  • Good Durability and Tension Stability: Features high molecular cross-linking to ensure the string retains its playability and “snap-back” longer than competing co-polys.

  • Ten-Sided Axial Profile: A unique twisted, decagonal shape that enhances grip on the ball for massive spin potential without sacrificing the consistent feel of a rounder string.

  • Available in Multiple Gauges: 1.24mm for the “all-rounder” balance of durability and playability. 1.30mm for maximum control and durability for chronic string-breakers.

Best For

Intermediate to advanced players seeking a powerful, all-purpose polyester string that offers elite spin potential and an arm-friendly, forgiving feel.

Additional information

Length

12m, 120m, 200m

Gauge

1.24mm, 1.30mm

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