Poly folders in super bright colors will liven up your desktop and are easy to find in any filing system. It's the toughest file folder around, and it comes in opaque colors to color code your filing system for speed and efficiency. Durable poly material is tear and water resistant and easy to clean. Fits any vertical or lateral filing system. File Folder Size Type: Letter; File Folder Color: Blue; Color Family: Blue; File Folder Material: Polypropylene.