The 6.9 cm (2.7 inch) [55 x 41 mm] is a screen size measurement for a specific device that our website sells screen protectors for. This measurement is important for customers to know so they can ensure they are purchasing the correct size screen protector for their device. By providing this information on our website, customers can easily find the right screen protector for their device and protect their screen from scratches, cracks, and other damage.