This is a 11x8 airplane propeller. It is a "tractor" (not a "pusher") prop. 

FEATURES
Computer-optimized design gives these props a thinner profile
and more "bite" with less noise.
Lightweight molded nylon construction reduces rotating mass for
higher output and longer life.
Reinforcing carbon fibers help maintain true, constant pitch at
any rpm.
"C2" design (see "COMMENTS").

INCLUDES
One 11x8 Carbon-Reinforced NYLON Sport Propeller

REQUIREMENTS
ALL props require balancing, this is VERY important, use TOPQ5700.
May need prop reamer, use GPMQ5005 (SAE) or GPMQ5007 (Metric)

SPECIFICATIONS
Length: 11" Pitch: 8
Thickness at hub: 1/2" Hole diameter: 1/4"

COMMENTS
The "C2" stands for the production run of this propeller.