Sera Scraper XL is an aquarium glasse cleaner with a strong handle and 3 interchangeable tools for cleaning the inside aquarium glass appropriately and very gently. The sera Scraper XL glass cleaner allow quick and thorough removal of algae and other dirt on the aquarium glass. The set contains three different tools that are easy to change - one stainless steel blade for glass, one plastic blade for acryl glass, and a sponge for soft layers - for cleaning the inside aquarium glass appropriately and very gently. Even persistent algae can be removed without effort. Replacement blades are separately available.