This double-sided 500/4000 ultra-fine grit buffer comes in a pack of 5 and is for use on natural nails. It's perfect for smoothing and finishing your manicures. The 500-grit side of the nail buffer is designed for refining the natural nail surface after shaping and the 4000-grit is our finest grit buffer available. Ideal for buffing nails to reveal a high-gloss shine, this side will polish nails for a glossy finish - perfect for a natural manicure without using any nail polish. Hello healthy-looking nails! This double-sided 500/4000 ultra-fine grit buffer comes in a pack of 5 and is for use on natural nails. It's perfect for smoothing and finishing your manicures. The 500-grit side of the nail buffer is designed for refining the natural nail surface after shaping and the 4000-grit is our finest grit buffer available. Ideal for buffing nails to reveal a high-gloss shine, this side will polish nails for a glossy finish - perfect for a natural manicure without using any nail polish. Hello healthy-looking nails!