This is a package of APC Prop Adapter Rings for Thin Electric Propellers (Aircraft & Multi-Rotor). Fits all thin electric propellers with diameters between 8 inches and 25 inches. Also fits all multi-rotor propellers of all diameters.
This is an APC 4.1 x 4.1E Composite Speed 400 Electric Propeller. APC propellers are CAD-designed and manufactured to be lighter, stronger and produce less noise and more power than typical propellers.
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