These are in my opinion the best prop for the money . They may not be the ultimate for a top notch contest ship but I've used too many of them to say that I've ever been disappointed with them. Did I mention that they are CHEAP to buy, balance is generally right on , my engines seem to be quieter with them? and they are just heavy enough to provide some flywheel effect to most engines. I've never tried to twist them and doubt that it can be sone, don't hold me to that though. they will break and reasonably easily on asphalt.
Dennis