FLIX TIP Rocker- Black FLIX Brushes have superb 'feel' and balance and employ a range of fibers specifically selected from various materials for their weight, flexibility and durability. FLIX should not be confused with cheap fiber, far-east imports. The fiber fan on all FLIX brushes can be spread to suit your individual preference. Also, as fibers are retractable, FLIX brushes can be played with fibers set to a choice of length to achieve different sounds and 'feel'.