Tecnifibre-XR3 Tennis String Natural-() Tecnifibre XR3 provides players with the best all around string. This structured hybrid consists of 3 monofilaments with a multifliament impregnated polyurethane heart, which creates a smooth impact for aggressive hitters... Spl Technology | Smooth Impact Feeling | Multifilament And Monofilament Hybrid Size - (See Description) | Color - (See Description) Authorized Tecnifibre Dealer. All racquets are strung and ready for the courts! SEE SELLER DETAILS FOR RETURN POLICY.