In order to extend the usage time of bearings and to conform to the high load running. DAG try to optimize the inner design of bearing, adopt the advanced heat treatment product line and the whole set of manufacture equipment for ferrule and the process of steel ball grinding from Germany and also we use shell grease lubricant, which lower the noise and friction torque efficiently. Bearings with 3mm outer diameter to 1700mm outer diameter are available. They are various in size and shape. The inside track and outside track are all cambered, which can support load in both radial and axial direction and the mixture load.