Live Wire Professional 17 offers Gut like performance in a multifilament string. Includes 50% more Live Wire Iso Elastic Fibers, which increases resiliency and elasticity, and 20% more High Impact Urethane Resin for improved vibration dampening.PEEK Abrasion Resistant Fibers help increase string life and contribute to a crisp, solid feel. More spin friendly but slightly less durable than its 16 gauge counterpart. Gauge 17 1.25mm Length 40 feet 12.2 meters Available colors Natural NOTE Gamma's performance guarantee only applies if racquet is strung by Tennis Warehouse.