This is the 10x4.5 MR Multi-Rotor Pusher Propeller from APC.
**Not for use with gasoline engines.**
Designed for counterclockwise rotating only
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
10x4.5 MR Multi-Rotor Pusher Propeller from APC
Hub Diameter: 0.65" (16.51mm)
Hub Thickness: 0.35" (8.89mm)
Shaft Diameter: 1/4" (6.35mm) for engine
Weight: 0.53oz (15.02g)
Maximum RPM Limit: 105,000/prop diameter (inches)