This replacement brush head made for the Clarisonic Pedi Foot Transformation device is a combination of short, rigid filament bristles and longer flexible bristles to thoroughly exfoliate and buff dry, cracked feet . The filament blend is designed to allow for optimal migration of the Pedi-Buff for more even coverage and thorough exfoliation. The Clarisonic Pedi Device is precision-engineered with an entirely new motor, running at a powerful "foot frequency" that safely exfoliates rough, dry foot skin. Our facial cleansing devices run at a gentler "face frequency," and aren't designed to drive the Pedi Smoothing Disc and Wet/Dry Buffing Brush Head.Warnings Do not operate Clarisonic facial brush heads on the Pedi Device. The Pedi System is to be used only on the feet and should not be used on the face or other areas of the body. Do not use the Pedi Device for any application other than its intended use on the feet.