This is an APC 22x10 Composite Airplane Propeller.  

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

INCLUDES
One APC 22x10 carbon-reinforced nylon propeller

REQUIREMENTS
ALL props require balancing, this is VERY important, use TOPQ5700.
May need prop reamer, use GPMQ5006 (SAE) or GPMQ5007 (Metric)

SPECIFICATIONS
Length: 22" Pitch: 10
Thickness at hub: 1/2" Hole diameter: 1/4"

COMMENTS:

Do not tighten prop nut excessively or operate propeller if any
indications of resonance exist.