The Fein Triangular sanding sheets are for universal use of coarse to fine grinding on most materials. It also is unperforated and has aluminum oxide and full resin bond make for easy material removal. Includes (10) 60 grit sanding sheet, (10) 80 grit sanding sheet, (10) 120 grit sanding sheet, (10) 180 grit sanding sheet, and (10) 240 grit sanding sheet.