Wilson NXT Duramax Natural is an excellent choice for players after a soft, comfortable string that also maximizes durability. Formerly known as NXT Max, this string’s core is constructed of PU impregnated polyamide fibers. The result is a string plays comfortably while still offering solid power and feel on contact. Abrasion Shields are utilized to protect the inner fibers, yielding improved endurance and resistance to premature breakage. The 16 gauge diameter blends improved feel with a high level of durability. The 15 gauge will further increase the durability factor. Wilson NXT NXT Duramax Naturalprovides players with a string choice that offers the comfort and power of a multifilament in a construction that also maximizes durability and string life. Composition: Polyurethane bonded polyamide fibers Color: Natural Gauge: 1.32mm Length: 40 ft