They're rubber sealed ball bearings, that provide smooth rotation, great accuracy of accessory and simplified upkeep. • 730 Sealed Ball Bearings x2 • Applications contain M-chassis gearbox area. • Using ball bearings in the place of synthetic and steel bearings offers better rotation and better components setup. • These ball bearings employ blue rubber seals in the place of metal people – this permits you to start the bearings to completely clean and concentrate to them. Blue plastic seals additionally greatly aid in preventing debris going into the race roller. • Low-viscosity oil is used to lubricate the internal workings. • Periodically perform upkeep such as for example adding oil; after crashes, checking bearing motion is preferred.