Topspin Topcybersil17R Cyber Flash String 17G 1.25Mm Reel Red Limited EditionThe new TOPSPIN CYBER FLASH is a string manufactured from optimized PETP with a state-of-the-art structure. (Sop system) Our practical tests show that this strings durability is without equal today. String slip is very low, even with extreme topspin. This significantly inc..