Sector 9 Black Ball Ceramic Bearings
7 Ball Black Ceramic Bearings-Silicon Nitride Ceramic
Extra Hard, High Density Black Ceramic Balls-Lighter than Steel Corrosion Resistant, Waterproof Balls Removable Rubber Shield for Easy Cleaning Nylon Ball Retainer with Grease/Oil Mix for Speed & Longevity Ceramic does not break down like steel thus eliminating steel debris that normally lead to bearing breakdown Ceramic balls actually keep the steel races clean due to their extra hard properties by crushing debris and continually polishing the races  
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