This is the APC Composite 17X6 RC Plane Propeller

Sport
IMAC Aerobatic

Pitch (inches): 6
Propeller Diameter (in.): 17
Hub Diameter: 1.25 in.
Hub Thickness: 0.70 in.
Shaft Diameter: 5/16 in.
Product Weight: 3.95 oz.
Color: GREY