Parrot produced their props out of polycarbonate plastic(stronger and more flexible). Most aftermarket props out there, are being made from ABS plastic. There is a big difference in how the drone performs vs the two types and ABS could be leading you down a vibrating jello path literally. The problem is no one is making polycarbonate for the bebop, if you know of a vender that is making them out of poly, let us know.