Players seeking the maximum levels of playability and power from a synthetic string will enjoy Wilson Synthetic Gut Power. Previously known as Extreme Octane, this string retains the same solid nylon core that provides crisp feel and solid durability. The high energy outer wrap allows for increased power levels and improved feel on contact. This string is offered in several different gauges, allowing you to choose which levels of durability and feel suit your game. Wilson Synthetic Gut Power is an excellent choice that will stand out in looks and all court performance in any racquet.  Composition: Solid Nylon Core with Outer Wrap Color: Gold, Black, White Length: 40'