NOTICE: These bearings are designed for the rear hubs on the Serpent Cobra 811 8th Scale Nitro Buggy. This buggy uses 4 of these Revolutions in the hubs where the rubber seal is on the flange. This is the ONLY car that uses these bearings, if looking for your Losi 8ight, please click here for the seal on the non-flanged side.
The Revolution Ceramic 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. Instead of the steel balls they use silicone nitride ceramic balls (Si3N4). Rubber seals are great protectors against dirt but the price is that they offer a little more friction due to the tighter seal. Now the performance of a metal shield is excellent but allows dirt to get in easily. So with the Revolution series, you run the rubber side towards the outside and the metal towards the inside. You get the protection of the rubber but the added performance by having one less rubber seal. But you don't have to stop there, if you are truly performance oriented and want the least amount of friction then you are in luck. You can quickly pop off the rubber seal with an exacto and place the metal shield facing outward in your hubs. This is the best performance you could attain while maintaining some protection from dirt.
8x14x4 Rubber bearing by Avid Racing Concepts is the standard bearing for the Serpent Cobra 811 hubs. Check your manual for the correct size for your vehicle.