Brand from Japan: BN. Quickly files off gel or adjusts the length of acrylic nails, saving time.Set of 2: 100G and 150GHow to use:Can be used to remove gel or adjust the length and shape of artificial nails.Use different grits to suit your preference.If you use the file while pulling the skin on the side of the nail down with your thumb, you can prevent the file from hitting the skin around the cuticle.