OverviewPRODUCT INFORMATION This is the 4x2.5 Propeller for Electric Flight by GWS. This shape is constructed for direct drive applications. FEATURES: Black nylon construction. INCLUDES: 1 Piece of 4x2.5 Propeller for Electric Flight SPECS: Color: Black Length: 4"(102mm) Pitch: 2.5 Prop blade width: 13mm Diameter: 4mm mounting hole. COMMENTS: For electric flight only. Do not modify or attempt to use with Glow engines.