JESA bearings were made using aerospace-grade steel for the outer race, and also double-polished the outer and inner race to provide the least amount of friction possible. 

The balls go through a number of stages of polishing, far more than any standard ABEC 5, 7, or 9 bearings to make sure that they are as round as possible. 

Additionally, the lightweight plastic cages allow for lower rolling resistance. To help reduce drag, Jesa increased the radial clearance providing slightly fewer total contact ball patches. Finally, we use a special lightweight racing oil from Germany called Kluber oil to top the bearing off. 

The result is the fastest steel skate bearing on the market!