100/180 GRIT DOUBLE SIDED NAIL FILES: The coarse side of 100 grit is excellent choice for artificial nails, used to shape and file acrylic nails and thick toenail; The fine side of 180 Grit is in medium coarseness, excellent for shaping natural nail edge and refine shapes, and to prepare natural nail ready for applying any product on it; PREMIUM QUALITY MATERIALS: Nail Files from are made of top quality sand paper, EVC and Emery board materials, with the specially designed shape of half moon/Arc to make a better filing experience. All great material and great design make great products of durability and sturdiness. HANDY AND PORTABLE SIZE: The 7.1 inches length of emery board nail files is just right size for holding, neither too big nor too small; it is in your palm of hand to file and trim, or to put it in your purse and take it on the go for traveling; The round top is much easier for trimming, buffing, shaping; MULTIPLE USEGES: these nail files can be widely used for all kinds of different nails and situations, fox example, natural nails, acrylic, poly gel, hard gel, dip power nails, and even for your pet cats/dogs nail trimming and grooming! You can also buy it to treat yourself, or just wrap them as a gift for friends.