InstaView Expandable Desktop Reference System with Assorted BordersAffordable solution for keeping frequently used reference documents at your fingertips. Consists of panels with rugged outer frames, 5 snap-on tabs, a panel holder, a wire desk stand, and two snap-on connectors. Expand the system, with additional InstaView units and use the connectors included to link units together. Two each of black, blue, green, red and yellow. Rack Style: Reference.