The thought process behind the ArboRapid system didn't end at the pole, as evidenced by the cutting force shown in their two blade choices. Both blades are made from a high quality flexible steel featuring hard chromium plating. The teeth themselves are also impulse hardened which keeps their tri-edges sharper, longer. Each blade features a bark cutter, and fits perfectly with any of the ArboRapid poles. The difference in the two blades is their size, one being 13 inches long, and the other 15.75. The longer blade also features skip grooves to help clear the kerf as you cut.