My Bad ,
These are different to to previous ones I ordered the first reviewer is correct.
Jun 01, 2012
Am using them on a Quad with cf2822 motors, found to be a lot tougher than standard 9x5. They seem to be more efficient as flight time is slightly extended. Have just purchased some more.No harder to balance than standard 9x5.
Certified Buyer Rated
May 03, 2012
These seems weak and break extremely easy, required a lot to balance. Not worth the time or cost buy another bargain brand