320 Grit Silicon CarbideSandpaper 5-1/2" x 9" Sheet (6 Sheets), 6PK It is best for metals (particularly harder metals) and is the only grain that can be used on glass, stone and marble..
320 Grit Premium Woodworking Sandpaper 5-1/2" x 9" Sheet (6 Sheets), 6PK This material is an excellent substitute for garnet paper, and in most applications will outlast garnet. These abrasive sheets are the choice of professional woodworkers for sanding a wide variety of bare and unfinished goods.