The Revolution Series bearings are a low friction bearing with several options to help satisfy anyone's desire. What makes this bearing unique is that it has a rubber seal on one side while having a metal shield on the other. Rubber seals are great protectors against dirt but the price is that they offer a little more friction due to the tighter seal.
1/4 x 1/2 x 3/16 Revolution bearing by Avid Racing Concepts is the bearing used in the RPM hub carriers for the RC10GT. If you need bearings for the stock hub carriers, those are 3/16 x 3/8. Check your manual for the correct size for you vehicle if you are not certain.