Nylon Cleaning Brush The 9" Randy's Black cleaning brush is made of Nylon and Galvanized Steel. The 3/4" cleaning brush is perfect for cleaning large water pipes, hand pipes and vaporizers. For an extensive range of other styles check out our preserve section. Brush Features Size 9" x 2" Brush Size 3/4" Black Nylon Made of Nylon and Galvanized Steel Great for Large Water Pipes