Feature: Compatible with multiple models used for cordless string s: 1 This spare spool kit is designed for cordless s. With the help of the automatic paper feeding system, changing the spool can reduce the work of manually winding the spool. Compatible spools use centrifugal to feed the as needed. The high-quality weeder cord can easily cut through grass and weeds. More convenient to use and store: the automatic feeding system replaces the spool and saves the time of manual winding and cutting machine. Technical index material: plastic Spool diameter: 4 m spool Bobbin length: 1.6 mm line Use suggestions: Always wear goggles. Please unplug the tool before replacing, installing or removing accessories. The package includes: 1 trimming line