Wilson Extreme Octane String is a premium “synthetic gut” for the Wilson line. This traditional feeling string has a solid core with Nomex (X-Band) wraps. Extreme Octane utilizes similar construction to the No. 1 selling Prince Synthetic Gut w/Duraflex with adjustments to the composition designed to eliminate stiffness and increase comfort.We ship to all Domestic US Addresses. At this time, we do not accept international orders.We Accept PayPal As The Only Method Of Payment. Immediate payment is required. If payment can't be made immediately, please contact us for exceptions before purchasing.This listing is for 6 packages of string. If you have any additional questions or would like more information, please let us know!