The Seachem Algae Scraper is designed with versatility in mind. With three retractable blades: metal, plastic, and soft pad, it is suited for both glass and acrylic aquariums. It is lightweight and features an ergonomic handle, making it comfortable to hold in multiple positions. In addition, it floats for easy retrieval. Finally, its white colour makes it easy to see the algae you want to remove and when you’ve effectively removed it. Sizes: 12 inches (31 cm), 18 inches (46 cm) Ergonomic handle allows for easy use in multiple positions Retractable blade housing safely hides the blade while not is use. White design contrasts with algae, so you can see what you are removing Floats for easy retrieval Handle hole for hanging storage Three possible tools: Metal Easily removes tough algae in glass aquariums. Not for use on acrylic. Plastic Safe for use on glass and acrylic. Use care at gravel line to avoid scratching acrylic Soft Pad Your first choice for acrylic aquariums. Easily removes algae from scratches.