3m privacy filters keep confidential information private only persons directly in front of the monitor can see the image on screen others on either side of them see a darkened screen designed to fit standard laptops with a diagonally measured 15 viewing screen and a 43 aspect ratio actual filter dimensions are 12 wide x 9 high 304 mm x 228 mm includes your choice of two easy to use attachment methods reversible matte side reduces glare and reflections lightweight thin frameless d