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 and 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 and securely to handle (sold separately). Simply listen for the click.