This is the authentic APC 12x4.5 MR Multi-Rotor Propeller manufactured by Landing Products.
****Not for use with gasoline engines.****
FEATURES: Composite nylon construction, gray in color Specifically designed for multi-rotor applications .
APC's Thin Electric and Slow Flyer props MR series is lighter than the Thin Electrics,
with a higher RPM capability than Slow Flyers
INCLUDES: One 12x4.5 MR and one 12x4.5 MRP Multi-Rotor Propeller. Adapter Rings included
Hub Diameter: 0.65" (16.51mm)
Hub Thickness: 0.36" (9.14mm)
Shaft Diameter: 1/4" (6.35mm)