Double-sided with 100/180 grit: so you can choose according to your preference, where the coarse side is used to buff the uneven nail surface and the fine side is used to buff the grease on the nail surface; Long-lasting and washable: the grit on the surface of the buffing blocks is consistent, washable, and durable; works great for buffing acrylic nails, natural nails, dipped nails, and false nails, even removing nail gel/glue at home; the foam pad can take better care of your nails and give you a consistent and comfortable filing experience; Just the right size to hold: the 3.4-inch buffing block is just the right size, not too big or too small; it fits in the palm of your hand for buffing or to take with you on your travel; Perfect gift ideas: You can buy it to treat yourself or just wrap it as a gift and she/he will love it!