Our sanding discs are made of high-quality aluminum oxide abrasive, which is durable and anti-clogging. The aluminum oxide grain delivers a fast cut and a smooth finish to your project. Also, helps you achieve an optimal sanding. Hook and Loop sticks to the 9-inch drywall sander easily, will not fall off when installed in use and has 8 holes for dust pickup. The sander discs are great for sanding a variety of surfaces including wood and drywall.