MALISH 13" POLYPROPYLENE CARPET BRUSH w/NP-9200 PLATE fits most 15" machines,most 15" machines MALISH 13" POLYPROPYLENE CARPET BRUSH w/NP-9200 PLATE fits, ), Polypropylene is less expensive than the Nylon versions available, which make it ideal for less use and/or rental situations, It just depends on how much you plan on using the brush as to which Material (Nylon or Poly) will be best for your needs,(The NP-9200 clutch plate DOES NOT fit ALL machines, fits most 15" machines MALISH 13" POLYPROPYLENE CARPET BRUSH w/NP-9200 PLATE.