2Pcs 50mm 5 Blades Ducted Fan Propellers for 5.5mm Dia Motor Shaft Product Name : 5 Vanes Ducted Fan Propeller;Rotor Diameter : 1.97"(50mm) Fit Motor Shaft Diameter : 5.5mm/ 0.22";Hub Thickness : 23mm/ 0.91" Material : Plastic;Color : Black Weight : 9g Package Content : 2 x 5 VanesDucted Fan Propeller