This is a 3M anti-glare filter AG190C4B for 5:4 ratio 19.0-inch screens. From the manufacturer: Description Diffuses light so your screen is easier to see in challenging and changing indoor lighting conditions, brightly lit indoor areas and near windows Matte surface helps reduce glare and fingerprints Details Anti-glare: Yes Aspect Ratio: 5:4 Blue Light Reduction: No Brands: 3M? Catalog Number: AG190C4B Device Type: Monitors Display Diagonal: 19 in Display Diagonal (Imperial: 19 in Display Diagonal (Metric): 482 mm Film Classification: Anti-Glare Filter Dimensions (width x height): 14.83 in x 11.89 in Filter Dimensions - Metric (width x height): 377 mm x 302 mm For Device with Raised Bezel: Yes Orientation: Landscape Reversible: Matte-to-Matte Screen Attachment: Adhesive Strips, Slide Mounts Touch Compatibility: Yes Part Number: AG190C4B3M ID: 7100028680 UPC: 051128829912