3M Pro-Pak aluminum oxide sheets features tough, durable aluminum oxide coating. Ideal for sanding wood, paint, metal, plastic, drywall and fiberglass. Long-lasting. 3M Pro-Pak aluminum oxide sandpaper are the abrasives are the choice of professionals for sanding a wide variety of materials and surfaces. This durable sandpaper and outlasts ordinary glue bond paper. Made with aluminum oxide minerals. Life cut of the sandpaper and outlasts ordinary glue bond paper.