Are bearings and balls in 81-137 stainless steel?

A quick learner from Illinois says:
Ordered 6 81-137 REVERSE MOUNT ROLLER ASSEMBLY, STAINLESS STEEL.Are bearings and balls all SS. If not can these be taken apart to install SS bearings?Thank you.PAUL.630*531*1002
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Dave Sr. from SWISCO responded:

I believe they are stainless being that the wheel itself is stainless. However I don't believe it would be an easy job to switch out bearings. The wheels and housing are riveted together at the factory. Best to keep the wheels lubricated to keep them in good working order just to be safe.

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