WHAT IT IS Professional quality 240/1200 grit gray and black buffer. WHAT IT DOES 240 grit refines new and rebalanced enhancements. Perfect for natural nail P.R.E.P and to shape natural nails. 1200 grit smooths new and rebalanced enhancements and natural nails. The soft padded abrasive conforms to the natural nails eliminating flat spots and providing comfort for the user.