The 33.3 cm (13.1 inch) [290 x 163 mm] is the screen size of a specific device that our website sells a range of screen protectors for. This size is important to know when selecting the appropriate screen protector as it ensures a perfect fit and maximum protection for the device's screen. By offering a range of screen protectors specifically designed for this size, our website provides customers with the peace of mind that their device is protected from scratches, cracks, and other damage that can occur from everyday use.