HQ Prop 4x4.5 Orange CW Pair The end result of the HQ Prop 4x4.5 is increased thrust and stiffness while still allowing you to fly it on 4 prop sized airframes. The HQ prop was inspired by the original Lumenier version of the Graupner 10x5 cut down to 8x5.A set of 2 HQ propellers 2 blade style with a 5mm center hub. They come with a set of plastic reducers. A good prop for small planes and multi-rotors. (multi-rotor applications would need both CW and CCW) Spec . Rotation CWLength 4 inchPitch 4.5 inchMaterial Nylon Glass FiberWeight 2.3 gramsHub ID 5mm / 9.5mmHub OD 13mmHub thickness 7mm . Includes . 2x 4x4.5 CW black nylon/glass fiber propellers2x sets of prop reducers. .