Scrubber refill heads are designed for use in Scotch-Brite Disposable Toilet Scrubbers for more stain removal power. They deliver effective scrubbing power to problem areas with a bleach-alternative cleaner. Built-in, bleach-alternative cleaner with pumice scrubs away rust & hard-water stains. Uniquely shaped disposable head design is shaped to fit under the rim. It is easier to scrub away grime you never knew was under there. Head attaches quickly & securely to handle (sold separately). Simply listen for the click.