Magnolia Brush No. 11 line floor brush. Dark red coarse gauge polystyrene plastic in center rows. Fine gauge black plastic in border rows. Recommended use for wet or dry sweeping. The coarse plastic bristles in the center rows sweep the heavy debris while the finer plastic on the border sweep the finer dirt. Good on rough or smooth concrete, asphalt, wood, etc. 24-inches hardwood block and 3-inches trim.