Key Features Handy and easy to grip handle Magnetic Glass cleaner Effectively removes algae from tanks Clean the glass without getting wet hands. For Tanks up to 5mm Glass thickness Oase Magnetic Aquarium 5mm Glass cleaners are handy tools that help to keep your tank clean without you getting wet hands. The cleaners have strong magnets in each section that connect through the glass in your tank. From there you can guide the external section around the tank, allowing the internal part to clean the inside of the tank as they glide together. The cleaner easily and effectively removes algae that sticks to the side of your aquarium. Each cleaner has been made with a handy and easy to grip shape and can be used in Fresh and Salt Water tanks. 5mm Glass Cleaner Dimensions (L/W/H): 58 x 52 x 35mm For Max Glass thickness: 5mm