They are plastic sealed ball bearings, providing smooth rotation, great accuracy of accessory and simplified maintenance. • 730 Sealed Ball Bearings x2 • Applications have M-chassis gearbox area. • utilizing ball bearings instead of artificial and metal bearings provides better rotation and better elements setup. • These ball bearings use blue synthetic seals in the place of metal people – this enables you to start the bearings to fully neat and concentrate for them. Blue synthetic seals furthermore greatly help in preventing debris entering the competition roller. • Low-viscosity oil is utilized to lubricate the internal workings. • sporadically perform upkeep like including oil; after crashes, checking bearing motion is preferred.