This is a 3M Anti-Glare Filter AG236W9B for 16:9 ratio 23.6-in monitors. The box and plastic are opened. From the manufacturer: Highlights 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: 0.672916666666667 Blue Light Reduction: No Brands: 3M? Catalog Number: AG236W9B Device Type: Monitors Display Diagonal: 23.6 in Display Diagonal (Imperial): 23.6 in Display Diagonal (Metric): 599 mm Factory ISO Certification: No ISO Certification information available Film Classification: Anti-Glare Filter Dimensions (width x height): 20.54 in x 11.56 in Filter Dimensions - Metric (width x height): 522 mm x 294 mm For Device with Raised Bezel: Yes Orientation: Landscape Reversible: Matte-to-Matte Screen Attachment: Adhesive Strips, Slide Mounts Touch Compatibility: Yes Part Number: AG236W9B3M ID: 7100095874 UPC: 051128006719