GOSEN MULTI CX 17 TENNIS STRINGING SERVICE TECGUT Series This premium string utilizes a unique heat-resistant CX fiber to significantly enhance durability without sacrificing the soft, comfortable feel of a multifilament. It’s a fantastic choice for players who want the power of nylon with a much longer lifespan. Perfect for those who hit hard but still value control and arm protection. Material: Highly elastic special Nylon multifilament, highly heat-resistant yarn (CX), hybrid high-performance Resin, special composite yarn Gauge: 1.24mm (17GA.) Length: 12.2m Place of origin: Japan Color: Natural Proper tension: 45~60lbs