This is the ElectriFly by Great Planes 2¼" Transparent Blue Spinner.
FEATURES: Great upgrade for Great Planes E-Performance series ARFs
Lightweight aluminum backplate with stepped adapter hole for easier
more accurate reaming
Drilled for ¼" (6mm) shaft with drill guides for 5/16" (8mm) shaft
One year limited warranty
INCLUDES: Spinner, backplate and two phillips head screws
Instructions inside header card
REQUIRES: Installing on motor shaft
SPECS: Length from Backplate to tip of Spinner: 2.2" (56.5mm)
Diameter: 2¼" (57mm)
Weight: .70oz (20g)
COMMENTS: Also available in Transparent Red GPMQ4725, and Transparent Black
GPMQ4724