The Rubbermaid Commercial 9B57 tile and grout brush has brass bristles and a yellow plastic structural foam block and handle and can be used for cleaning tiles and grout lines. The brass bristles are resistant to rust and wear and are more flexible than typical steel bristles, making them better suited for cleaning tiles, bricks, or other surfaces that may be scratch-prone. The bristles are arranged in two rows to facilitate cleaning along grout lines and in other hard-to-reach spots. The plastic structural foam block and handle resist cracking, warping, and bacteria growth. A hole near the end of the handle allows the brush to be hung for storage. The brush measures 8-1/2 inches long.Rubbermaid manufactures cleaning, organizing, and material handling products for commercial, medical, and industrial applications. The company, founded in 1933, is headquartered in Huntersville, NC.