Contemporary wire design of these trays provides open visual access to documents and files. Wire design will not collect dust and dirt. Stack vertically with Fellowes Wire Desk Tray Supports (sold separately) that correspond to tray size. Steel tray is 100 percent recyclable.Contemporary wire design of these trays provides open visual access to documents and files. Wire design will not collect dust and dirt. Stack vertically with Fellowes Wire Desk Tray Supports (sold separately) that correspond to tray size. Steel tray is 100 percent recyclable.