The red nylon bristles provide the aggressive scrubbing action needed for most extremely dirty and greasy grouted and textured hard floors such as quarry tile, textured vinyl, epoxy, brick, slate, ceramic, granite and rubber floors. Counter revolving bristles circulate the HOST through the carpet for excellent cleaning results. The length of the bristles helps circulate the HOST deep into the pile while lifting the pile and reviving the texture. For use on HOST Liberator. Set of two.