• The package includes 4 replacement trimmer spools, 1 replacement spool cover, and 1 replacement spring. • The strong nylon wire structure ensures fewer breaks and a longer life. • The automatic spool feed system makes tedious work easier. • It uses centrifugal force and aerodynamics to reduce resistance and achieve quick and clear cuts. • High cutting efficiency thanks to the fineness and flexibility of the wire, allowing even the thickest grass to be cut.