I agree with Will. The Stainless Steel bearings that came in the Hanno's always lasted me between 600 and 700 flights. I have 5 Hanno's and have been using the Boca or Bearing Brothers St. Stl. series bearings. I have been told that ceramic bearing sometimes require special lube or they may not last as long as the cheaper stainless unit.

Hope this helps.

Peace

Mark O