These are the 5x4.3 Propellers for Electric Flight by GWS. This shape is constructed for direct drive applications. FEATURES: Orange nylon construction INCLUDES: Six 5x4.3 Propellers for Electric Flight by GWS SPECS: Length: 5" Pitch: 4.3 Prop blade width: 15.5mm Diameter: 4mm mounting hole. COMMENTS: For Electric flight only. Do not modify or attempt to use with Glow engines. JAW 1/18/10