Nail art files are high quality adhesive tape and emery board materials, Sandpaper on surface, foam on second layer, plastic in middle-level, Round top & double sides design, sturdy & durable nail files provides you a comfortable nail doing experience. DOUBLE SIDED GRIT:: Ideal for artificial nails and toenails, suitable for shaping, 180 Grit: ideal for natural nails, suitable for smooth, The mid-layer plastic backing is extremely durable, waterproof and washable, The foam core is firm but still somewhat flexible, can help prevent your nails from being filed too harshly