Badminton string KIZUNA Japan Z69 premium [Z69] ultra-durable 0.69mm.Badminton string Ultra-endurance and soft feel at impact gauges produce of 0.69mm, it was realized the durability of the series the highest level.It is recommended string for those who focus on durability.Specification:** Gauge : 0.69mm** Feeling : Soft** Material and Structure: • Core yarn: high-strength nylon/multifilament • Side yarn: high-strength nylon/blading processing** Made in Japan