Emery Board Files
An emery-board nail file is made with cardboard or wood that has an abrasive material used to file the nail glued to it — a.k.a. emery. Hanna says that this type of nail file is best suitable for your natural nails and great for shaping.
Metal Nail Files
Often made of steel, these tend to the most durable of all nail files and are therefore the strongest option for nails. A metal or steel nail file are best suited for those who naturally have thicker nails or if you like using fake nails, says Hanna. Because of its abrasiveness, she recommends using this type of nail file carefully.
Crystal Nail Files
Both gentle and durable, crystal nail files are the best of both worlds, which a fine grit that makes them ideal if you're concerned about potentially causing damage to sensitive nails. "They are great for natural nails, as they minimize the risk of splitting or damaging the nail plate," says Hanna. "They are also great to smooth out the rough skin around the cuticle area that meets the free edge of the nail."