Desk reference system offers a way to keep frequently used reference documents at your fingertips. Display important document in the included 10 letter-size, nonglare, double-sided polypropylene panels (20 viewing sides) with rigid borders and five snap-on tabs. Reference system includes a wire desk stand and two snap-on connectors. To expand, use included connectors to link systems together. Additional InstaView systems are sold separately.Desk reference system offers a way to keep frequently used reference documents at your fingertips. Display important document in the included 10 letter-size, nonglare, double-sided polypropylene panels (20 viewing sides) with rigid borders and five snap-on tabs. Reference system includes a wire desk stand and two snap-on connectors. To expand, use included connectors to link systems together. Additional InstaView systems are sold separately.