This is a 7x5E Thin Composite propeller from Advanced Precision Composites.
For use on electric powered aircraft only (not for glow engines).

FEATURES: Gray composite propeller blades that assemble onto a propeller hub.
Comes with two adapter rings that adapt to different motor shafts.
Comes in a bag attached to a header card.

INCLUDES: One composite propeller
Two composite adapter rings
One instruction sheet

SPECS: Diameter: 7"
Pitch: 5"
Hub inner diameter: 0.25"