Brand from South Korea: baren. Benefits:A two-sided nail file helps create desired nail shape best for natural nails.The coarse side with 180 grit helps easily adjust nails' shape and length.The fine side with 220 grit enables better refinement to create your desired nail look.Made with high-quality stainless material for hygienic application.How to use:1. Use the coarse side to adjust the length and shape of your nails as desired.2. Use the fine side to give a refining touch.