Duo brush kit features a 4-inch diameter flat brush for fast large area scrubbing and a 2-inch diameter small round brush for access to narrow or tight spots. Both brushes are Soft bristle White drill-driven brushes. Drillbrush was established in 2007, we have been designing and innovating brushes based on feedback and demand from our valued customers. Our brushes are professional quality and have been tested and approved by commercial cleaners, marinas, detail shops, and others industry “hands on, daily user” reviewers to be the absolute best solution for a wide variety of cleaning and scrubbing tasks. Always look for the “Drillbrush Power Scrubber” logo to insure you are buying an authentic Drillbrush from the leader in drill powered cleaning brushes. Drill NOT included.