Propeller Diameter: 4 inch Pitch : 2.5 Blades : 2 Material : Poly Carbonate Weight :1.45g Hub Diameter : 9.8mm Hub Thickness:5mm Shaft :1.9/1.5/1.9mm Adaptor Rings : NO Includes 2 x CW HQProp T4X2.5 propeller 2 x CCW HQProp T4X2.5 propeller