ASHAWAY-Crossfire Zyex 17G Tennis String-(813862021379) Ashaway Crossfire ZX is built for extreme durability. A combination of Kevlar and Monogut ZX Pro, this string will allow for control without sacrificing a lively feel on contact... Hybrid Combination | Durable | Tension Stability Size - (See Description) | Color - (Gold) Authorized Ashaway Dealer. All racquets are strung and ready for the courts! SEE SELLER DETAILS FOR RETURN POLICY.