These fine grit sanding sheets are ideal for the final sanding of your project before applying paint or stain For use on 1/4 sheet clamp-on palm or finishing sander Made with premium P-grade aluminum oxide grain, which creates a consistent scratch pattern and helps create a finer final finish Heavy duty backing resists tearing The double resin bonding system locks the grain to the paper, and resists heat and humidity, extending the life of the sanding sheet Aluminum oxide durable grains are tough and durable, and are recommended by professionals for sanding a wide variety of materials including wood, metal, fiberglass, and painted surfaces