Evaluation: The KIZUNA Z58 Premium / Medium - 0.58 mm has received special attention from our testers due to its status as the thinnest string in the world. It exceeded all expectations and was the only string to achieve the unanimous top value of 5.0 in 3 categories - namely for "good feel (touch / feedback)", for "control during short play" and nothing else to be expected in the categories: "Sound". In the other disciplines, too, the KIZUNA Z58 only just missed the maximum values. But the weak point of extremely thin strings also came to light in the evaluation of “controlled power transmission with hard smashes”. Nevertheless, an impressive 3.8 was scored here. We can recommend this string to all players for whom good feedback and feel (with an incomparable sound!) is more important than extreme durability.