This is the APC 7x4 Free Flight Airplane Propeller.
Lightweight injection molded nylon construction reduces rotating mass
for higher output and longer life
Reinforcing carbon fibers help maintain true, constant pitch at any
Gray in color
APC 7x4 Free Flight Airplane Propeller
Hub Thickness: 0.40" (10.1mm)
Hole Diameter: 0.18" (4.5mm)