A Stainless Steel 10 BallBearing Size C.
A stainless steel 8 BallBearing Narrow Size C .
A Chrome Steel 8 BallBearing size C "Flat".
A Concave Ceramic 10 BallBearing Size C.
A Ceramic Concave stainless steel 8 BallBearing. These are replacement bearings with Concave profile and available in ILYY (metric) Size.