The Prince(R) Synthetic Gut with Duraflex(R) tennis string showcases a unique construction that is designed to provide enhanced durability and control for your game. Go up strong against the competiton with a string that ensures durability with every hit. Design Details All around racquet string Monofilament core construction Increased durability Exceptional control Gauge: 16 / 1.30 mm Length: 40 ft / 12.2 m