thanks for the report and confirmation, Ray.... i think your 'spin' test was simple and effective - i never thought of that, but its a perfect test. the front bearings in the X-Power set are steel, but they are sealed. the rear are ceramic but the one installed inside the diff housing (not the one on the shaft) has exposed balls (i think cuz its enclosed and has little exposure to dust). all 4 of my dNano run this set
