wrote in message
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yes and no.....thin plated bearings...gray bearings go with worn/used
hubs.

Grade 5 go with above average hubs or as new hubs...grade 5 runs new
longer than gray bearings.

The new ball bearings were very shiny when I put them in, and sort of grey
when I examined them a few days later to see why the hub hadn't stayed
adjusted for long.

All the shinyness had become little shiny flecks in the grease.