The 38.1 cm (15 Inch) [331.6 x 186.6 mm] refers to the size of the screen that our website sells screen protectors for. This size is commonly found in laptops, notebooks, and some desktop monitors. By providing this information, customers can easily find the right screen protector for their device and ensure that it fits perfectly. Our website offers a range of screen protectors that are specifically designed for this size, providing protection against scratches, smudges, and other types of damage. With our high-quality screen protectors, customers can keep their devices looking new and functioning properly for longer.