This is a Master Airscrew 9X7 3 Blade Pusher Prop.

9x7 - 3-Blade Propellers for Model R/C Airplanes

3 blade model airplane propellers specially developed for the most demanding hobby professionals. Great performance and scale look both for electric motors and glow engines. Carefully crafted from Glass Fiber Reinforced Composite. Available in sizes 5" to 16".

Propeller diameter		9" / 229mm
Propeller pitch		7" / 178mm
Hub thickness		7/16" / 11.1mm
Shaft diameter		1/4" / 6.35mm **
Propeller Weight		0.71oz / 20.1g
Direction of rotation		Reverse / Pusher
Material		Glass Fiber R Composite
Color		Black