White Disk Scrub Brushes for RT120 Floor Scrubber Machine  (Pack of 2) Medium gauge brushes (19 – 21 gauge) which are good for all-purpose cleaning on most floor types, including tile, grout, and wood. White Disk Scrub Brushes are: Softer than black disk scrub brushes in bristle material. Suitable for delicate or polished floors, such as marble, hardwood, or linoleum. Designed to provide gentle cleaning without scratching or damaging sensitive surfaces. Ideal for maintaining gloss and shine on surfaces that require a lighter touch. Used for regular maintenance cleaning on surfaces that don’t require heavy agitation.