The 43.4 cm (17.1 Inch) [378 x 212.8 mm] is the screen size of a specific device that our website sells screen protectors for. This information is important for customers to know as it ensures that they purchase the correct size screen protector for their device. By providing the exact measurements, customers can be confident that the screen protector will fit their device perfectly and provide optimal protection against scratches, cracks, and other damage. Our website offers a range of screen protectors specifically designed for this device, ensuring that customers can find the perfect fit for their needs.