Three replacement ABS blades to be used in the Flipper Standard Magnetic Aquarium Algae Cleaner on acrylic tanks from 1/4" up to 1/2" (6mm - 12mm) thickness. These ABS replacement scraper blades are designed with an ultra low profile making it easy to clean the hard to reach areas of the tank! Blades are interchangeable and replaceable. For use in the Flipper Standard Magnetic Cleaner on Acrylic Tanks from 1/4 up to 1/2 (6mm - 12mm) thickness Includes three replacement ABS blades Complete cleaning without ever getting your hands wet! Plastic blade: Made for acrylic tanks