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 so they can select the correct size and type of screen protector that will fit their device perfectly. The 256 x 144 mm measurement refers to the dimensions of the screen in millimeters, which is another important factor to consider when choosing a screen protector. 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.