A. This is a unique nail file made of sponge material and shaped like a tofu block. It is designed in the form of a square grinding block and comes in a variety of styles, including grinding, coarse - grit, fine - grit, and multi - sided styles, which can meet different nail art needs. B. This tool is widely used in the nail art process. The coarse - grit side can quickly shape the nails and effectively trim the nails to the desired length and contour. The fine - grit side is used for further fine grinding of the nail surface to make the nail edges smoother and prevent scratches. The grinding side can give the nails a shiny luster, making them look more delicate. C. Its multi - sided design integrates multiple functions and can be easily switched during the nail art process without frequent tool changes, greatly improving the efficiency of nail art. D. Whether it's a professional nail artist creating complex and beautiful nail designs or an individual doing simple nail care and grooming at home, it is a practical and considerate helper.