MonkeyfingeR REvolution Bearing - Large or C size

These are amazing bearings, especially for the price. After several hours of play, one of these bearings, in a “WEDGE” yoyo, suddenly become responsive. At first I thought I had damaged it somehow, but it was just a bit of grease that had shifted into the race of the bearing(they appear to be pre-lubed with some kind of grease or thicker oil, and may require some break-in). I have two of these and both were the same. Both were easily broken in with some fast and hard pinwheels, and play perfectly unresponsive.