LONGER TRIM: Trim length is longer, provides increased aggression, greater conformability and longer product life AGGRESSIVE BRUSHING: Rectangular filaments provide a less compliant brushing action for much greater aggression and reduced conformability, due to their shape, larger cross-sectional area and increased contact with the work SILICON CARBIDE (SIC): sharp-edged grain that produces an effective cutting action. It is the most common grain used in industrial grade brushes SPECIFICATIONS: 6' Nylox Disc Brush, Rectangular Filament, 120SC Fill, 7/8' Arbor Hole Country of Origin: United States of America