The nail files are made of high-quality Eva and sponge; you can easily shape the edge of the nail and polish the surface of the nail. The polishing effect is amazing. 180/100 grit on 2 sides. Applied for both natural or false nails to shape up uneven cuticle on your nails, using before applying nail polish or nail treatments. Orders of 5000 pieces or greater are eligible for sea shipping. 100% guarantee for quality.