OREGON Techni-blade Nylon Line - 7mm x 26cm 155 Pieces. Techni-blade is a serrated nylon strimmer line ideal for heavy duty work such as overgrown grass and weeds as well as resistant brambles and undergrowth. Its reinforced surface with sharp, pinch hardened teeth give excellent performance and its rugged square shape has up to 27% more material for greater efficiency than its round equivalent. This durable line is made up of 50% flexible core and 50% reinforced outer skin that is very heat resistant with a high melting point of over 250°C. It has an aerodynamic design for reduced noise and lower fuel consumption than equivalent square lines. The Techni-blade 7mm line has been d esigned for Oregon's Jet Fit heads, part numbers 111109 and 111110 (not included). Please ensure you check in your machine's manual for recommendations and what size of line it can take.