Professional Nail File - 100/180 grit, made from heavy duty boards. Dual Sides - This nail file set is ideal to remove for acrylic and extension nails, file and rough up the hard fingernails and toe nails in 100 grit, while 180 grit smoothes up your nail edge with refined shape. Curved Nail File - With Ergonomic Design, its curved section makes it easier to file the sides of the nail, and the rounded edge is great for filling near the cuticle. It feels comfortable in your hand and is easy to operate with both left and right hands. Enduring & Reusable - The nail files for gel nails can be easily cleaned with water and soap or disinfectant to maintain hygiene between uses. This nail files for natural nails ensures durability and longevity even with frequent use.