These are the 3.25x3 Propellers for Electric Flight by GWS.
This shape is constructed for direct drive applications.
FEATURES: Orange nylon construction
INCLUDES: one 3.25x3 Propeller for electric flight
SPECS: Length: 3.25"
Mounting Hole Diameter: 1mm
COMMENTS: For Electric Flight only. Do not modify or attempt to use with Glow