Advantus - AVT37678 Bring a clean, modern look to your office with this letter tray. Its distinctive style is created using a unique, two-step process that fuses a high-gloss plastic interior to a slightly textured, matte exterior to create bold contrast in color and texture. Stackable design can be used with additional letter trays (sold separately) for space-saving organization. Letter tray is designed to hold letter-size and A4-size documents and folders.