Durability StringsFriction is the number one cause of string breakage. As the strings rub back and forth on each other they can cut or notch. When the notching becomes too deep, the strings break. HEAD durability strings are extra resilient to notching for maximum durability. Overview Durability Strings
 | FXP Blend 17
Features Kevlar main strings and FXP™ Power cross strings with FiberGEL™ Tri-Cluster. Excellent choice for players looking for superb playability in a highly durable string.
Length: Kevlar 6,5 m; FXP Power 5,5 m Gauge: Kevlar 1,21 mm; FXP Power 1,24 mm Colors: natural |

 | FiberGEL Blend
Features:
- Hybrid string using co-polyester for the mains and FiberGEL for the crosses
Benefits:
- Superior durability and control of co-polyester
- Added playability and feel of FiberGEL
- Excellent combination of feel and durability
Length: 12 m / 200 m Gauge: Main: 1.25 mm; Cross: 1.32 mm Colors: natural |

 | Competition II
Features:
- Monofilament polyester string
Benefit:
- Perfect blend of durability and playability
Length: 12 m / 400 m Gauge: 1.30 mm Colors: silver, natural |

 | UltraTour
Features:
- Uniquely refined co-polyester string
- Specially soft modecular crystal construction
- Combination of resins and fibers
Benefits:
- The Touring Pro string
- Co-polyester mix for softer, more elastic feel
- Extremely durable, even in thin gauges
- Perfect string for hard-hitting baseliners
Length: 12 m / 200 m Gauge: 1.20 mm, 1.27 mm Colors: blue, silver |

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