Large Cleaning Brush The 13" Randy's Black cleaning brush is made of Nylon and Galvanized Steel. The 1 1/2" 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: 13" x 3" Brush Size:1 1/2" Black Nylon Made of Nylon and Galvanized Steel Great for Large Water Pipes