As close as you can get to natural gut. Unique ribbon construction is woven around a Multifilament Polyamid fiber core. Maximum playability, with great topspin and extra durability. The item "Head Rip Control Tennis String" is in sale since Thursday, July 19, 2018. This item is in the category "Sporting Goods\Tennis\Strings". The seller is "stringersworld" and is located in Essex. This item can be shipped worldwide.