The 33.3 cm (13.1 inch) [290 x 163 mm] is the screen size of a specific device for which our website sells a range of screen protectors. This size is important for customers who want to ensure that they purchase the correct size screen protector for their device. By providing the exact dimensions of the screen, customers can be confident that the screen protector they purchase will fit perfectly and provide optimal protection for their device. Our website offers a variety of screen protectors for this size, including tempered glass, anti-glare, and privacy screen protectors.