"Creating a custom organization system for your desktop is simple with these smart trays. Self-stacking, no posts! Unique “Stack-Loc” feature keeps stacked trays together with locked-in stability. High-impact polystyrene has classic lines to go with any décor. Desktop File Folder Sorter Type: Horizontal and Stacking; Number of Compartments: 1; Material(s): Polystyrene; Height: 5"". Width: 8.5"". Depth: 11"". Gender: unisex."