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Old 07-18-18, 06:47 AM
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Join Date: Aug 2005
Location: Pittsburgh, PA
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Bikes: '96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '20 Surly Midnight Special, All are 3x10. It is hilly around here!

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You probably bought 300-series stainless steel bearing balls which are non to very weakly magnetic. They are extremely good for corrosion resistance but not that good for hardness and wear resistance and are usually specified when corrosion resistance is of primary importance. More common are 400-series stainless balls where corrosion resistance is not as important but hardness is and these are strongly magnetic. Regular chrome steel bearings are magnetic and harder and stronger yet but not as corrosion resistant. For bicycle use chrome steel is the best choice for cost and durability.
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