This is Echo's 21" double-sided, double-reciprocating RazorEdge blades for long-lasting sharpness. 25.4 cc professional-grade two-stroke engine manufactured from military-grade magnesium. 42" shaft enables operator to trim tall hedges. 7 degree angled shaft provides a wide-angle view for trimming complex shapes. Easy start-ability especially for re-starts in hot, dusty climates. Large 20.6 fluid ounce fuel tank for extended run time between fill-ups. Offset gear case design provides ideal spacing between user and cutting surface. Over-molded front and rear hand grips for extreme comfort