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. By providing this information, customers can easily identify the correct screen protector size for their device and ensure that it fits perfectly. Our website offers a variety of screen protectors that are designed to protect the device's screen from scratches, cracks, and other damages. With our high-quality screen protectors, customers can enjoy a clear and vibrant display while keeping their device safe and protected.