This bristle cleaning brush consists of metal “bone column” and a sturdy hard bristle head. 1.4 inches longer than the ordinary brush, along with high-density arrangement technology, for rigid bristles to remove dirt, mud, mold and soap slag. It has two sizes of crack cleaning brushes to meet the needs of different areas of cleaning. Large brush: ideal for grout, shower door tracks and more. Small brush: ideal for accessories and other small spaces. It has strong flexibility and wear resistance. After being dirty, wash with water to restore the cleaning as new. U-style handle design with a hole for comfortable storage, easy to hang and store. It adopts a long strip design, the extra long brush can penetrate deep into cracks, easily rubbings all the difficult places to reach where dirt accumulates.