Use Coarse Side to File the Desired Length & Shape of the Nail. Use Other Side to Smooth Nail. Nail Smoother Cube Block the Double Sided Emery Boards Have Round Ends, Which Can Provide You a Rather Comfortable Nail Filing Experience. Nail Smoother Cube Block Suitable for Manicuring, Surface Sanding, Removal of Fingernail. Nail Smoother Cube Block Disposable Nail File, Healthier & Can Save You From Washing the File After Using. Nail Smoother Cube Block Also Suitable for the Hotel, Hotel Disposable Cleaning & Care Products. Nail Smoother Block