6905 Color: Maroon Grit: Very Fine Type: Aluminum Oxide - For basic cleaning and finishing. May be used with solvents 6910 Color: Gray Grit: Ultra Fine Type: Silicon Carbide - For cleaning and finishing. May be used with mild detergents 6915 Color: White Grit: Non-Abrasive Type: N/A - For polishing and light cleaning 6920 Color: Black Grit: Medium Type: Aluminum Oxide - For heavy-duty cleaning or fast action finishing. May be used with most solvents