Demon BB85CB-2 Ceramic ball, Bearing 5 x 8 x 2.5mm. High specification. (Pair)
Very smooth ceramic balls with steel shields.
High tolerance with minimum slop.
5mm bore x 8mm outer x 2.5mm width.
Note: When replacing bearings, push them in by the outer edge of the bearing.
If very tight, use the old bearing to push on top of the new one.
Do not put high force on the centre as that can damage the cage which holds the balls in place.
All bearings need some light oil after cleaning.