A softer co-polyester monofilament with maximum durability, great power, precise control, and improved tension maintenance.Specifications:String type: Co-Polyester monofilamentKey characteristics : Power,Control, Durability, and Playability. Color: GoldUnits/Lengh: Set (40 Feet / 12.2 Meters).Available Gauge: 16 / (1.28 mm)