Live Wire Professional 16 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. Gauge 16 1.32mm Length 40 feet 12.2 meters Available colors Natural NOTE Gamma's performance guarantee only applies if racquet is strung by Tennis Warehouse.