Get smooth and consistent finishes on fiberglass, composites, wood, and aluminum, even in micro-finishing applications, with an A290 fine-grit paper disc on your sander or grinder. This long-lasting disc features a P-graded aluminum-oxide abrasive to deliver a fast, reliable cut-rate, and its open coat design and water-based stearate, No-Fil coating minimize loading so your finishes are consistently impressive.