General purpose 1.65mm Duo-Twist nylon strimmer line designed for professional performance and durability. Fits most makes of Trimmers & Brushcutters. Please check your model for compatibility. Special Co-polymer formulation provides lond lasting cutting.Twisted Trimmer line adds strength, improved efficiency and reduces noise levels. This line is a step up from the round style line and offers durability when hitting concrete or hard surfaces. This trimmer line can help reduce trimmer vibrations and noise levels while giving you a clean, even cut.