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These nylon two-wheel carriers attach to the top of RV drapes and ride inside an I-beam track, giving the curtains smooth, even movement across the window instead of dragging or sticking.
They're designed to work with I-beam track hardware such as RV Designer's A208, and come in a pack of 14, enough to outfit a full window's worth of drapery.
A simple fix when old carriers wear out or a drape needs to be rehung on new track hardware.