Long wearing polymer material with serrated edge for maximum cutting performance. Fits most gas & electric String trimmers. Includes 440 Of .065" Commercial trimmer line. 6 pt. Star line style. Cutsup to three times more area than economy lines. .065" Diameter Blue line contains 22 refills, 440 Of commercial trimmer line 6 pt. Star line style long wearing polymer material with serrated edge for maximum cutting performance Fits most gas & electric String trimmers Cutsup to three times more area than economy lines clear dispenser Pack.