This is the Great Planes PowerFlow 11x8.5 Electric Propeller.
Constructed of plastic, Black in color
One Great Planes PowerFlow 11x8.5 Electriv Propeller
Length: 11" (279mm)
Pitch: 8.5" (216mm)
Hole Diameter: 1/4" (6mm)
Installing on motor shaft
For electric flight ONLY, do not use with nitro powered aircraft.