This is an 8x3.8 Slo-Flyer Pusher Propeller from APC
Lightweight molded nylon construction reduces rotating mass for
higher output and longer life
Designed for electric powered Park Flyer type aircraft with rear
facing motors that "push" the airplane forward
8x3.8 Slo-Flyer Pusher Propeller with two locating rings and
Length: 8" Pitch: 3.8"
Hub Thickness: 0.30" Hub diameter: 0.50"
Hole Diameter: 1/4"