... floor , liquid penetrant or hardener and densifier for floor. After rough and fine grinding and polishing with the polishing pads , ... .Black pad10",13",17"The material is harder,and it's for dewaxingBrown pad10",13",17"Softer ... than the black pad,and it's for dewaxing and cleaningRed pad10",13",17"It's ... pad10",13",17"It's for cleaning and crystallizingGreen pad10",13",17"Softer than the brown ...