Ideal for Walk-Behind Mowers & Heavy Trimmers: This commercial-.155' diameter line is specifically designed for high-power, large equipment, including walk-behind string mowers and professional-gas trimmers. For Aggressive Clearing: Recommended for heavy brush, thick weeds, tall grass, and overgrown property. This line's toughness prevents breakage during aggressive clearing where standard line fails. Maximum Cutting Efficiency: Features a unique 5-cutting edge shape and directional aerodynamics for aggressive slicing, delivering a faster, cleaner cut in challenging environments. Ultimate Impact Resistance: Formulated superior wear copolymers and outstanding toughness to resist breaking when encountering tough obstacles like fence posts, heavy dirt, and rock gardens. Convenient Pre-Cut Segments: Comes in a 10-count of 21-inch pre-cut segments for quick and simple loading. Eliminates line waste and the hassle of winding bulk spools.