Heavy Duty String Trimmer Line: Made with long-lasting nylon co-polymer break less formula for a more durable line for less stops during work to replace. Triangle Shape: Triangle string trimmer line offers more durable and effective cutting for all jobs and reduces cut time than standard round string trimmer line. .155” Line: Heavy-duty string trimmer line for long, tough jobs with dense grasses, woody shrubs and thick brush. Fits all Tri-clone’s TREX fast feed trimmer series heads, widely used for commercial landscaping and home and garden trimming jobs. Best Results: Adding moisture to the string trimmer line creates a more flexible and durable line. Soak line in water for 12 hours or overnight and let dry in the shade for about an hour to make longer-lasting, easier winding string before every loading. Spool Storage: 525 ft. line stored on spool for convenient storing and use. Kodiak 0.155” heavy-duty, commercial grade triangle string trimmer line works great for long, tough jobs with dense grasses, woody shrubs and thick brush. The triangle shape offers more durable and effective cutting for all jobs and reduces cut time than standard round string trimmer line. Fits all Tri-clone’s TREX fast feed trimmer series heads.