The 30.7 cm (12.1 inch) [261 x 164 mm] is the screen size of a specific device that our website sells screen protectors for. This size is important to know when purchasing a screen protector as it ensures a perfect fit and maximum protection for the device's screen. By providing the exact dimensions of the screen, customers can easily find the right screen protector for their device and avoid any potential issues with compatibility or fit. Our website offers a range of high-quality screen protectors specifically designed for this screen size, ensuring that customers can keep their device's screen safe and protected.