This APC AP05545E-B4 bundle is an RC propeller pack aimed at FPV racing use, supplied as a matched set with two standard-rotation and two reverse-rotation pcs to suit quadcopters that accept 5.5x4.5E blades.
The set is offered as replacement and tuning spares rather than a performance guarantee; fit these props wherever a 5.5x4.5E blade matches your motor shaft and mounting hardware. Keep props paired by rotation when installing on a four-motor platform so motor torque and yaw balance stay correct.
Installation notes: mount each prop in the correct rotation position, secure fasteners to the usual torque for your frame and prop adapter, and check runout before flight. Replace any prop showing visible nicks, delamination, or imbalance rather than attempting repairs.
Tuning role: swapping blade sets or changing between standard and reverse rotation in matched pairs is a common way to trim thrust, responsiveness, and throttle feel on FPV quads; small pitch or blade-size changes will alter acceleration and efficiency, so test changes incrementally.
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