GBC Solids Standard Presentation Covers, Non-Window, Square Corners, Black, 50 Pieces Per Box (2514493) SOLID COVERS  Sturdy, plastic covers provide your work with solid protection. Made from heavy-duty plastic material, they ensure your work is safe from spills and mishaps. UNPUNCHED FOR EASY USE  Unpunched covers can be used with any binding spine, in any binding style that suits your needs. CONVENIENT SQUARE CORNERS  Clean-cut square corners bring definition to your bound projects for a neat presentation. VERSATILE USE  Solid covers work well as front or back covers. Pair them with complementary Clear View presentation covers, or use a matched pair of them together. 50 PER PACK  A pack of 50 covers makes an excellent addition to your stock of office supplies.