ISTA 3-in-1 Maintainer Cleaning SetIt comes with a plastic scraper, rubber scraper, scrubber and two extending rods. The scrubber features a swiveling head to help your reach into all sides of the aquarium, while the plastic scraper is used to remove algae and calcium carbonate residue that tend to grow on the interior surface of the aquarium. The rubber scraper, on the other hand, is ideal for removing smudges and water stains on the exterior surface of the aquarium. Each piece is