... bearings1.Ring: stainless steel or Gr15 steel material2.Ball:ZrO2 or Si3N4 cramic material3.Cage:Nylon or steel ... About the Corrosion resistance, nonmagnetic insulated, high temperatures of Ceramic ball hybrid bearings1. (Outer, inner ring with stainless steel or Gr15 ... steel, ball with ceramic ZrO2 or Si3N4 material, the cage with PTFE ...