This is the 9X6.5" Formula One Propeller by Master Airscrew|
This series was designed for Formula One, Pylon, and Combat flyers
The blades are narrow and thin for racing.
Glass-filled nylon construction
One Master Airscrew 9X6.5" prop
Depending on the engine crankshaft size, the propeller may need to
be reamed to a larger size using GPMQ5005 (SAE) or
Center Hole Diameter: 3.045" (19/64)