These 14" brushes are used on the Fang 28 walk behind automatic scrubber, and the machine needs 2 brushes to scrub any type floor. The poly brushes are of medium duty, and can be used for any type of scrubbing. Take a look at our 14" stripping pads for stripping floors with the Fang 28. For more information on how to properly scrub a floor, take a look at our auto scrubbing procedures in our resource center.