These are the 8x4F Folding Propeller Blades 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
(hub not included, see REQUIRES).
Comes in a bag attached to a header card

INCLUDES: Two composite propeller blades
One instruction sheet

REQUIRES: 45mm prop hub and hardware for assembly, use APCQ4390.
Hand and eye protection when operating propeller.
ALL props require balancing (use TOPQ5700)
May need prop reamer, use GPMQ5005 (SAE) or GPMQ5007 (Metric)

SPECS: Diameter: 8"
Pitch: 4