The 30.7 cm (12.1 inch) [261 x 164 mm] is the screen size of a specific device, and our website sells a range of screen protectors that are designed to fit this size perfectly. These screen protectors are made from high-quality materials that provide excellent protection against scratches, cracks, and other types of damage that can occur to the device's screen. By using one of our screen protectors, customers can ensure that their device's screen remains in pristine condition, which can help to extend its lifespan and improve its overall performance.