Only conditionally recommendable because of severe imbalance

I have these propellers used on my Dickie Toys quadricopter, which appears to be largely identical to the Hubsan X107 (first model). The propellers have exactly the same shape and size, only the axle bore not continuous, but not too disruptive - they sit slightly higher but fixed.

To devalue the flight behavior led to replacement of all four Orginialpropeller against this set. The quadricopter flew but had very rough ANEs and seemed less agile. By means of a broken Dremel miniature drill that matched coincidentally in the thin shaft and the thicker edge, and a glass table, I quickly found out that half of the rotors in the turn one direction, a strong imbalance had - the opposite half on the other hand was ok within normal tolerances. With a bit of sandpaper, the propellers were on one side then visible although shorter, but thus far as balance, that the normal flight behavior was given again.

Before I discovered this propeller, I had bought at Conrad, a spare set of two black and two orange propellers (each with two lines in the opposite color). They were included in the price, although more expensive than this set of three, but better balanced than the original rotors, which is likely to have an impact not only on flight characteristics, but also to the life of the engines. These propellers are incidentally performed slightly wider at the ends, so get out a bit more angular, but otherwise have the same dimensions. From Material ago they act a little more stable, but that can also be a subjective impression.

Who has frequent wear on propellers, and Those who try a balancing that can access here. Otherwise, I would rather advise to high end models - one simply has more pleasure and less trouble!