The Scrubbing Bubbles Fresh Gel Toilet Cleaning Stamp provides freshness with every flush. Simply stamp 1 of the toilet cleaning gel discs under the rim. Each stamp lasts up to 12-days. No touching. No scrubbing. No anything. Just continuous, flush-activated, freshening action. Scrubby calls it a hands-free way to help keep toilet rings and limescale build-up away. Stamp color may vary depending on fragrance. Odor-eliminating freshness every time you flush. That's cleaning reinvented. Color: Clear.