Bifold Track question

A quick learner from San Francisco says:
With the cost difference between the brown and the white track is the brown 'heavy(er) duty'?
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Paul from SWISCO responded:
The white and brown steel tracks use the same thickness of metal. The difference is the fittings they use, which is the important thing to match when choosing a new track. The cost of the two different fittings and the different availability of the two parts accounts for the cost difference.
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