This is a 10x5E 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 five adapter rings that adapt to different motor shafts.
Comes in a bag attached to a header card.
INCLUDES: One composite propeller
Five composite adapter rings
REQUIRES: ALL props require balancing, this is VERY important
SPECS: Diameter: 10"
Pitch: 5
Hub inner diameter: 0.25"