All wound up. Need to replace the cutting string on your Sun Joe bump feed grass trimmer, but want to save yourself the time and hassle of winding your own spool? The TRJ601ERS is a pre-wound, dual-line replacement spool that make it quick and easy to change the spool on your Trimmer Joe, so your trimming task gets done without any kinks. Designed to fit Trimmer Joe model TRJ601E. The TRJ601ERS replacement spool is factory-wound with durable nylon for tough cutting and maximum reliability. No more frustrating line jams! Just smooth cutting action throughout the entire trimming process. This spring unwind with the reliable performance that Sun Joe dual-line replacement spool brings to your Sun Joe bump feed grass trimmer.