PF13.3 fits standard notebook computers with a 13.3" viewing are Actual filter dimensions are 7.99" high x 10.63" 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 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; helps keep confidential and private information private - 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 - One year warranty from date of purchase