The 30.7 cm (12.1 inch) [261 x 164 mm] is the screen size of a specific device that our website sells a range of screen protectors for. This size is important for customers to know as it ensures that they purchase the correct size screen protector for their device. Our website offers a variety of screen protectors that are specifically designed to fit this size, providing customers with the best protection for their device's screen. By providing accurate information about the screen size, we aim to make the purchasing process as easy and hassle-free as possible for our customers.