Patent attributes
A modular product display system has at least two vertically stacked layers. Each layer has at least one roller track supported on one longitudinal end by a rail such that the one longitudinal end is at a different elevation than the other longitudinal end. At least two vertical stacking side barriers are disposed at laterally spaced apart positions between the roller track in each of the vertically stacked layers. The vertical stacking side barriers have protrusions on an upper edge and a lower edge engageable with corresponding openings in the roller track. Either (i) the protrusions on at least one of the upper edge and the lower edge are displaced from a plane of the vertical stacked side barrier, or (ii) the vertical stacked side barriers between the at least two vertically stacked layers are laterally displaced from vertical stacked side barriers between further vertically stacked layers.