PF13.3W fits widescreen notebook computers with a diagonally measured 13.31" viewable screen; actual filter dimensions are 7.06" high x 11.28" wide. This filter is designed for widescreen laptop computers with screens that appear more rectangular than square and have a 16:10 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. 3M"s PF13.3W Privacy Filter provides 1.5 times more effective privacy than competitive filters and offers more consistent quality and uniform appearance, thus reducing visual distractions.