Yuauy 4 pairs 10x4.5" 1045L/R CW CCW Nylon Propeller / Multi-Copter quad Copter Material: Nylon Size: 10 x 4.5"/ Length : 256mm Diameter of Shaft : 6.0mm / Thickness of center : 10.0mm For Vehicle Type: Airplane, Helicopter Nylon pads Aperture: 3.0mm 3.175mm 4.0mm 5.0mm 6.0mm 6.35mm 7.938mm