Detailed Product Description Ceramic ball hybrid bearings1.Ring: stainless steel or Gr15 steel material2.Ball:ZrO2 or Si3N4 cramic material3. ... 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, ...