They're rubber sealed ball bearings, that provide smooth rotation, great accuracy of accessory as well as simplified upkeep. • 730 Sealed Ball Bearings x2 • Applications consist of M-chassis gearbox area. • Using ball bearings as opposed to plastic and steel bearings gives more efficient rotation and better components setup. • These ball bearings employ blue rubber seals as opposed to metal ones – this allows you to open up the bearings to clean and focus on them. Blue plastic seals additionally vastly aid in preventing debris entering the race roller. • Low-viscosity oil is used to lubricate the inner workings. • Periodically perform upkeep such as for example adding oil; after crashes, checking bearing motion is advised.