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PF12.1 fits standard notebook computers with a 12.1" viewable screen. Actual filter dimensions are 7.32" high x 9.74" wide. This filter is designed for non-widescreen laptop computers with screens that appear more square than rectangular and have a 4 x 3 aspect ratio. Notebook privacy filters keep confidential and private information private. Utilizes 3M's microlouver privacy technology so only persons directly in front of the monitor can see the image on screen. Passersby see only a dark screen. Reversible for either glossy or matte screen finish. Reduces reflections when used with the matte side facing you. Protects fragile LCD screens from scratches and fingerprints. New easy on easy off attachment system. Filter stays in place even when notebook computer is closed.