Finally, a pleasant trimming experience, 32 easy-loading, powerful, economical, strong and reliable No More Line, Aero-flex Line Blades: uniquely aerodynamic and streamlined )like an air plane wing) to recover lost drag power, save fuel, get bigger jobs done faster without the usual hassles. Scientifically engineered to outperform fishing lines: withstands concrete and fences, slashes heavier vegetation, cuts grass cleaner with lift, and blows debris. Simple and easy..never have to use string line.