Should I use nylon rollers or steel?

A handy person from Florida says:
is it better to use Nylon rollers than steel if I install the rail cap. My old steel rollers on the aluminum rail makes a black dust as it wears
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Dave Sr. from SWISCO responded:
I understand what you are saying about the dust, but I still prefer the steel roller. I don't think the nylon rollers will hold up as well. In fact, you might end up replacing the nylon rollers far sooner.
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