YTEX High Performance Strings specialize in polyester and co-poly tennis strings that deliver. Our manufacturing partner is based in England and has more than 25 years' experience producing "cutting edge" tennis strings. Our research and development team only design strings that will add the most value to a player's game. We have developed three unique brand products that will revolutionize the tennis market. The materials and manufacturing processes used in these products give players comfort, power and control with the added benefits of long-lasting performance and most importantly, excellent tension hold.