The purpose of the 17-inch Soft Carpet Cleaning Brush for Single Disc Scrubber is to effectively clean carpets using single disc scrubbers.  Two outside rows of stronger black bristles and two inner rows of softer white bristles make up this brush's soft nylon bristles.  While the interior bristles softly massage and loosen dirt for a deeper clean without harming the carpet fibres, the outer bristles efficiently scour and flex the carpet pile.