The 29.5 cm (11.6 inch) [256 x 144 mm] is the screen size of a specific device for which our website sells a range of screen protectors. This measurement is important for customers to know as it ensures that they purchase the correct size screen protector for their device. The 256 x 144 mm measurement refers to the dimensions of the screen in millimeters, which is also important for customers to know as it helps them to determine the exact size of the screen protector they need. By providing this information on our website, we aim to make it easier for customers to find the right screen protector for their device and protect their screens from scratches, cracks, and other damage.