The Tecnifibre ATP Razor Code 18 string reel utilizes Thermocore technology for excellent flexibility and spin potential in the co-polymer/polyester string category. Better tension maintenance and greater comfort than most other polys. Suited to the aggressive player seeking a more playable poly, without sacrificing control and ability to generate spin. Ultra thin 18 gauge for added playability. Convenient reel for frequent stringers or for custom hybrid use.