The Phase 4 Twisted Premium Grade Trimmer Line is stronger, quieter and cuts better than ordinary line. The weedeater line is .065″/1.65 mm thick and 40′ feet long. The aerodynamic design of our Phase 4 twisted trimmer line helps your trimmer work harder using less power. It nearly slices noise level in half. The twist also produces less line flutter resulting in a much cleaner cut than standard round or shaped line.