Heavy duty cleaning orbiter scrub brush for ORB550MC Orbiter Floor Machine.  Retail online for $44 before taxes and/or delivery.
12-Inch diameter scrub brush for Oreck Commercial 550MC orbiter floor machine (sold separately) to clean smooth textures or painted concrete floors and other scratch-resistant, high-traffic floors.  Polypropylene bristles can be used in wet or dry conditions to remove heavy dirt and debris and are resistant to stains, odors, bacteria, fungi, and wear.  0.028-Inch diameter bristles are crimped to better hold moisture without clumping together.  Orange for high visibility.