This is the 12x4.5 MR Multi-Rotor Propeller from APC.
**Not for use with gasoline engines.**
Composite nylon construction, gray in color
Specifically designed for multi-rotor applications
Bridges the gap between APC's Thin Electric and Slow Flyer props
MR series is lighter than the Thin Electrics, with a higher RPM
capability than Slow Flyers
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