The invention provides a flexible folding door adopted to be attached to an existing door jamb comprising a plurality of mini slats. A subplurality of mini slats are bounded on a forward end by a clip to establish a non-folding bound panel segment of the door. A second subplurality of mini slats establish the folding panel seam segments of the door. There is a dual caster assembly and a plurality of single caster assemblies attached to the top of the folding door. The caster assembly consists of at least two low friction wheels mounted on a U-shaped frame having depending legs, each depending leg having a low friction sleeve, the distal portion of each leg is attached perpendicularly to a ring. A stem is adapted to be seated through the ring and through an aperture in the clip and the top of the stem has a cap that overhangs the ring. A retaining pin secures the stem within the ring and thereby attaches the assembly to the clip and the folding door. The wheels of the caster assemblies are seated in the hanging channel track allowing the folding door to be slid open and closed.