These propellers work well, the flight characteristics of the mini quadrocopter do not noticeably change. I think they are stiffer than the OEM versions and feel more brittle, especially in cold weather. I've had to replace a couple or two after every branch I cut, which happens more often than I care to admit. OEM props take a few hits before they break. For the price, I will continue to use them as a backup. Note: You must apply the thread lock yourself. More sprockets if they were stronger…